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-x+15=7+3x+15
We move all terms to the left:
-x+15-(7+3x+15)=0
We add all the numbers together, and all the variables
-x-(3x+22)+15=0
We add all the numbers together, and all the variables
-1x-(3x+22)+15=0
We get rid of parentheses
-1x-3x-22+15=0
We add all the numbers together, and all the variables
-4x-7=0
We move all terms containing x to the left, all other terms to the right
-4x=7
x=7/-4
x=-1+3/4
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