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-3x+5(5x+2)=142
We move all terms to the left:
-3x+5(5x+2)-(142)=0
We multiply parentheses
-3x+25x+10-142=0
We add all the numbers together, and all the variables
22x-132=0
We move all terms containing x to the left, all other terms to the right
22x=132
x=132/22
x=6
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