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5(2x+8)=-31+51
We move all terms to the left:
5(2x+8)-(-31+51)=0
We add all the numbers together, and all the variables
5(2x+8)-20=0
We multiply parentheses
10x+40-20=0
We add all the numbers together, and all the variables
10x+20=0
We move all terms containing x to the left, all other terms to the right
10x=-20
x=-20/10
x=-2
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