You can put this solution on YOUR website! 5x-3=15-4x
And?
Do you want to solve for x?
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I'll solve for x, in case that's what the problem says, but it's a GREAT idea to say what you want to do.
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5x-3=15-4x
Add 4x to both sides
9x-3 = 15
Add 3 to both sides
9x = 18
x = 2