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(15x-21)+(16x-6)=-51
We move all terms to the left:
(15x-21)+(16x-6)-(-51)=0
We add all the numbers together, and all the variables
(15x-21)+(16x-6)+51=0
We get rid of parentheses
15x+16x-21-6+51=0
We add all the numbers together, and all the variables
31x+24=0
We move all terms containing x to the left, all other terms to the right
31x=-24
x=-24/31
x=-24/31
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