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x+5x=2x+40
We move all terms to the left:
x+5x-(2x+40)=0
We add all the numbers together, and all the variables
6x-(2x+40)=0
We get rid of parentheses
6x-2x-40=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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