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3(x+5)=140
We move all terms to the left:
3(x+5)-(140)=0
We multiply parentheses
3x+15-140=0
We add all the numbers together, and all the variables
3x-125=0
We move all terms containing x to the left, all other terms to the right
3x=125
x=125/3
x=41+2/3
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