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10=((1-y)*9.)+(y*13)
We move all terms to the left:
10-(((1-y)*9.)+(y*13))=0
We add all the numbers together, and all the variables
-(((-1y+1)*9.)+(+y*13))+10=0
We calculate terms in parentheses: -(((-1y+1)*9.)+(+y*13)), so:We get rid of parentheses
((-1y+1)*9.)+(+y*13)
We get rid of parentheses
((-1y+1)*9.)+y*13
We calculate terms in parentheses: +((-1y+1)*9.), so:Wy multiply elements
(-1y+1)*9.
We multiply parentheses
-9y+9
Back to the equation:
+(-9y+9)
(-9y+9)+13y
We get rid of parentheses
-9y+13y+9
We add all the numbers together, and all the variables
4y+9
Back to the equation:
-(4y+9)
-4y-9+10=0
We add all the numbers together, and all the variables
-4y+1=0
We move all terms containing y to the left, all other terms to the right
-4y=-1
y=-1/-4
y=1/4
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