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15-3x=20-x
We move all terms to the left:
15-3x-(20-x)=0
We add all the numbers together, and all the variables
-3x-(-1x+20)+15=0
We get rid of parentheses
-3x+1x-20+15=0
We add all the numbers together, and all the variables
-2x-5=0
We move all terms containing x to the left, all other terms to the right
-2x=5
x=5/-2
x=-2+1/2
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