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7x+3(5x+5)=-51
We move all terms to the left:
7x+3(5x+5)-(-51)=0
We add all the numbers together, and all the variables
7x+3(5x+5)+51=0
We multiply parentheses
7x+15x+15+51=0
We add all the numbers together, and all the variables
22x+66=0
We move all terms containing x to the left, all other terms to the right
22x=-66
x=-66/22
x=-3
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