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7x+3(7x-10)=110
We move all terms to the left:
7x+3(7x-10)-(110)=0
We multiply parentheses
7x+21x-30-110=0
We add all the numbers together, and all the variables
28x-140=0
We move all terms containing x to the left, all other terms to the right
28x=140
x=140/28
x=5
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