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25+2(x+5)+x=140
We move all terms to the left:
25+2(x+5)+x-(140)=0
We add all the numbers together, and all the variables
x+2(x+5)-115=0
We multiply parentheses
x+2x+10-115=0
We add all the numbers together, and all the variables
3x-105=0
We move all terms containing x to the left, all other terms to the right
3x=105
x=105/3
x=35
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