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-9x+8=-5x-28
We move all terms to the left:
-9x+8-(-5x-28)=0
We get rid of parentheses
-9x+5x+28+8=0
We add all the numbers together, and all the variables
-4x+36=0
We move all terms containing x to the left, all other terms to the right
-4x=-36
x=-36/-4
x=+9
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