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7x+50=90+3x
We move all terms to the left:
7x+50-(90+3x)=0
We add all the numbers together, and all the variables
7x-(3x+90)+50=0
We get rid of parentheses
7x-3x-90+50=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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