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6x+30+x=4x+90
We move all terms to the left:
6x+30+x-(4x+90)=0
We add all the numbers together, and all the variables
7x-(4x+90)+30=0
We get rid of parentheses
7x-4x-90+30=0
We add all the numbers together, and all the variables
3x-60=0
We move all terms containing x to the left, all other terms to the right
3x=60
x=60/3
x=20
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