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70-5x=80-9x
We move all terms to the left:
70-5x-(80-9x)=0
We add all the numbers together, and all the variables
-5x-(-9x+80)+70=0
We get rid of parentheses
-5x+9x-80+70=0
We add all the numbers together, and all the variables
4x-10=0
We move all terms containing x to the left, all other terms to the right
4x=10
x=10/4
x=2+1/2
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