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125+30x=215+20x
We move all terms to the left:
125+30x-(215+20x)=0
We add all the numbers together, and all the variables
30x-(20x+215)+125=0
We get rid of parentheses
30x-20x-215+125=0
We add all the numbers together, and all the variables
10x-90=0
We move all terms containing x to the left, all other terms to the right
10x=90
x=90/10
x=9
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