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15x-15=-4x
We move all terms to the left:
15x-15-(-4x)=0
We get rid of parentheses
15x+4x-15=0
We add all the numbers together, and all the variables
19x-15=0
We move all terms containing x to the left, all other terms to the right
19x=15
x=15/19
x=15/19
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