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-9x+13=-5x-3
We move all terms to the left:
-9x+13-(-5x-3)=0
We get rid of parentheses
-9x+5x+3+13=0
We add all the numbers together, and all the variables
-4x+16=0
We move all terms containing x to the left, all other terms to the right
-4x=-16
x=-16/-4
x=+4
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