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+9x+40=3x+100
We move all terms to the left:
+9x+40-(3x+100)=0
We get rid of parentheses
9x-3x-100+40=0
We add all the numbers together, and all the variables
6x-60=0
We move all terms containing x to the left, all other terms to the right
6x=60
x=60/6
x=10
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