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42+2x+8=13x-5
We move all terms to the left:
42+2x+8-(13x-5)=0
We add all the numbers together, and all the variables
2x-(13x-5)+50=0
We get rid of parentheses
2x-13x+5+50=0
We add all the numbers together, and all the variables
-11x+55=0
We move all terms containing x to the left, all other terms to the right
-11x=-55
x=-55/-11
x=+5
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