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7x+6(5x+20)=-9
We move all terms to the left:
7x+6(5x+20)-(-9)=0
We add all the numbers together, and all the variables
7x+6(5x+20)+9=0
We multiply parentheses
7x+30x+120+9=0
We add all the numbers together, and all the variables
37x+129=0
We move all terms containing x to the left, all other terms to the right
37x=-129
x=-129/37
x=-3+18/37
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