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100-4x=120-6x
We move all terms to the left:
100-4x-(120-6x)=0
We add all the numbers together, and all the variables
-4x-(-6x+120)+100=0
We get rid of parentheses
-4x+6x-120+100=0
We add all the numbers together, and all the variables
2x-20=0
We move all terms containing x to the left, all other terms to the right
2x=20
x=20/2
x=10
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