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11=x+0.8(12.5-x)
We move all terms to the left:
11-(x+0.8(12.5-x))=0
We add all the numbers together, and all the variables
-(x+0.8(-1x+12.5))+11=0
We calculate terms in parentheses: -(x+0.8(-1x+12.5)), so:We get rid of parentheses
x+0.8(-1x+12.5)
We multiply parentheses
x-0.8x+10
We add all the numbers together, and all the variables
0.2x+10
Back to the equation:
-(0.2x+10)
-0.2x-10+11=0
We add all the numbers together, and all the variables
-0.2x+1=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-1
x=-1/-0.2
x=+5
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