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50-8x=20+7x
We move all terms to the left:
50-8x-(20+7x)=0
We add all the numbers together, and all the variables
-8x-(7x+20)+50=0
We get rid of parentheses
-8x-7x-20+50=0
We add all the numbers together, and all the variables
-15x+30=0
We move all terms containing x to the left, all other terms to the right
-15x=-30
x=-30/-15
x=+2
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