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4x-40=2x+50
We move all terms to the left:
4x-40-(2x+50)=0
We get rid of parentheses
4x-2x-50-40=0
We add all the numbers together, and all the variables
2x-90=0
We move all terms containing x to the left, all other terms to the right
2x=90
x=90/2
x=45
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