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5(4x+3)=-105
We move all terms to the left:
5(4x+3)-(-105)=0
We add all the numbers together, and all the variables
5(4x+3)+105=0
We multiply parentheses
20x+15+105=0
We add all the numbers together, and all the variables
20x+120=0
We move all terms containing x to the left, all other terms to the right
20x=-120
x=-120/20
x=-6
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