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10x+40=4x+90
We move all terms to the left:
10x+40-(4x+90)=0
We get rid of parentheses
10x-4x-90+40=0
We add all the numbers together, and all the variables
6x-50=0
We move all terms containing x to the left, all other terms to the right
6x=50
x=50/6
x=8+1/3
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