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15-3x=6x+20
We move all terms to the left:
15-3x-(6x+20)=0
We get rid of parentheses
-3x-6x-20+15=0
We add all the numbers together, and all the variables
-9x-5=0
We move all terms containing x to the left, all other terms to the right
-9x=5
x=5/-9
x=-5/9
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