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20=7x+4x-35
We move all terms to the left:
20-(7x+4x-35)=0
We add all the numbers together, and all the variables
-(11x-35)+20=0
We get rid of parentheses
-11x+35+20=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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