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-7-9x=-12-15x
We move all terms to the left:
-7-9x-(-12-15x)=0
We add all the numbers together, and all the variables
-9x-(-15x-12)-7=0
We get rid of parentheses
-9x+15x+12-7=0
We add all the numbers together, and all the variables
6x+5=0
We move all terms containing x to the left, all other terms to the right
6x=-5
x=-5/6
x=-5/6
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