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0.18+y=0.4(7y-0.9)
We move all terms to the left:
0.18+y-(0.4(7y-0.9))=0
We calculate terms in parentheses: -(0.4(7y-0.9)), so:We get rid of parentheses
0.4(7y-0.9)
We multiply parentheses
2.8y-0.36
Back to the equation:
-(2.8y-0.36)
y-2.8y+0.36+0.18=0
We add all the numbers together, and all the variables
-1.8y+0.54=0
We move all terms containing y to the left, all other terms to the right
-1.8y=-0.54
y=-0.54/-1.8
y=0.54/1.8
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