Question 173562
{{{-7(a-8)=28}}} first thing you have to do is distribute the left side
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of the equation.  mult property of distribution states a(b+c)=ab+ac..so lets use this property
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-7(a-8)=-7a+56
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{{{-7a+56=28}}}now subtract 56 from both sides
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{{{-7a+cross(56)-cross (56)=28-56}}} combine terms on right side
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{{{-7a=-28}}} now divide both sides by -7
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{{{highlight(a=4)}}}