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+5(+5-x)-3(1-2x)=42
We move all terms to the left:
+5(+5-x)-3(1-2x)-(42)=0
We add all the numbers together, and all the variables
5(-1x+5)-3(-2x+1)-42=0
We multiply parentheses
-5x+6x+25-3-42=0
We add all the numbers together, and all the variables
x-20=0
We move all terms containing x to the left, all other terms to the right
x=20
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