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9(5-x)/8=-x
We move all terms to the left:
9(5-x)/8-(-x)=0
We add all the numbers together, and all the variables
9(-1x+5)/8-(-1x)=0
We get rid of parentheses
9(-1x+5)/8+1x=0
We multiply all the terms by the denominator
9(-1x+5)+1x*8=0
We multiply parentheses
-9x+1x*8+45=0
Wy multiply elements
-9x+8x+45=0
We add all the numbers together, and all the variables
-1x+45=0
We move all terms containing x to the left, all other terms to the right
-x=-45
x=-45/-1
x=+45
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