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-4x-15=-3x-19
We move all terms to the left:
-4x-15-(-3x-19)=0
We get rid of parentheses
-4x+3x+19-15=0
We add all the numbers together, and all the variables
-1x+4=0
We move all terms containing x to the left, all other terms to the right
-x=-4
x=-4/-1
x=+4
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