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42=3x+5x+10
We move all terms to the left:
42-(3x+5x+10)=0
We add all the numbers together, and all the variables
-(8x+10)+42=0
We get rid of parentheses
-8x-10+42=0
We add all the numbers together, and all the variables
-8x+32=0
We move all terms containing x to the left, all other terms to the right
-8x=-32
x=-32/-8
x=+4
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