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15=4x-
We move all terms to the left:
15-(4x-)=0
We add all the numbers together, and all the variables
-(+4x)+15=0
We get rid of parentheses
-4x+15=0
We move all terms containing x to the left, all other terms to the right
-4x=-15
x=-15/-4
x=3+3/4
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