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7x-8=-9x-4
We move all terms to the left:
7x-8-(-9x-4)=0
We get rid of parentheses
7x+9x+4-8=0
We add all the numbers together, and all the variables
16x-4=0
We move all terms containing x to the left, all other terms to the right
16x=4
x=4/16
x=1/4
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