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10(8+x)=140
We move all terms to the left:
10(8+x)-(140)=0
We add all the numbers together, and all the variables
10(x+8)-140=0
We multiply parentheses
10x+80-140=0
We add all the numbers together, and all the variables
10x-60=0
We move all terms containing x to the left, all other terms to the right
10x=60
x=60/10
x=6
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