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-7x-3(-7x+5)=-99
We move all terms to the left:
-7x-3(-7x+5)-(-99)=0
We add all the numbers together, and all the variables
-7x-3(-7x+5)+99=0
We multiply parentheses
-7x+21x-15+99=0
We add all the numbers together, and all the variables
14x+84=0
We move all terms containing x to the left, all other terms to the right
14x=-84
x=-84/14
x=-6
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