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6+1x=-15+4x
We move all terms to the left:
6+1x-(-15+4x)=0
We add all the numbers together, and all the variables
1x-(4x-15)+6=0
We add all the numbers together, and all the variables
x-(4x-15)+6=0
We get rid of parentheses
x-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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