Question 146383
Hi, Hope I can help
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-3(-x+4) = 3x - 12 
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First, You have to use distributive property
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-3(-x)+(-3)(4) = 3x - 12
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Next solve it even more
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3x - 12 = 3x - 12
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If you add 12 to both sides, it will be
3x - 12 + 12 = 3x -12 + 12, or
3x=3x
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If you divide everything by 3,
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{{{ (3x)/3 = (3x)/3 }}}, or 
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x = x
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That means "x" can be any number
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Let "x" = 6
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-3(-x+4) = 3x - 12 
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-3(-6+4) = 3(6) - 12 
(-3)(-2) = 18 - 12
6 = 6
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Let "x" = (-8)
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-3(-x+4) = 3x - 12 
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-3(-(-8)+4) = 3(-8) - 12 
-3(8+4) = 3(-8) - 12
-3(12) = (-24) - 12
(-36)=(-36)
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Hope I helped, Levi