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-7x+8(-1-3x)=-225
We move all terms to the left:
-7x+8(-1-3x)-(-225)=0
We add all the numbers together, and all the variables
-7x+8(-3x-1)-(-225)=0
We add all the numbers together, and all the variables
-7x+8(-3x-1)+225=0
We multiply parentheses
-7x-24x-8+225=0
We add all the numbers together, and all the variables
-31x+217=0
We move all terms containing x to the left, all other terms to the right
-31x=-217
x=-217/-31
x=+7
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