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6-7x=-15-4x
We move all terms to the left:
6-7x-(-15-4x)=0
We add all the numbers together, and all the variables
-7x-(-4x-15)+6=0
We get rid of parentheses
-7x+4x+15+6=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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