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3(-8-7x)=-213
We move all terms to the left:
3(-8-7x)-(-213)=0
We add all the numbers together, and all the variables
3(-7x-8)-(-213)=0
We add all the numbers together, and all the variables
3(-7x-8)+213=0
We multiply parentheses
-21x-24+213=0
We add all the numbers together, and all the variables
-21x+189=0
We move all terms containing x to the left, all other terms to the right
-21x=-189
x=-189/-21
x=+9
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