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-15-4x=6-5x
We move all terms to the left:
-15-4x-(6-5x)=0
We add all the numbers together, and all the variables
-4x-(-5x+6)-15=0
We get rid of parentheses
-4x+5x-6-15=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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