10(2.25-1.25y)+20y=30

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Solution for 10(2.25-1.25y)+20y=30 equation: 



10(2.25-1.25y)+20y=30

We move all terms to the left:

10(2.25-1.25y)+20y-(30)=0

We add all the numbers together, and all the variables

10(-1.25y+2.25)+20y-30=0

We add all the numbers together, and all the variables

20y+10(-1.25y+2.25)-30=0

We multiply parentheses

20y-10y+22.5-30=0

We add all the numbers together, and all the variables

10y-7.5=0

We move all terms containing y to the left, all other terms to the right

10y=7.5

y=7.5/10

y=5/6.6666666666667

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