0.8*(35-y)+1.5y=42

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Solution for 0.8*(35-y)+1.5y=42 equation: 


Simplifying
0.8(35 + -1y) + 1.5y = 42
(35 * 0.8 + -1y * 0.8) + 1.5y = 42
(28 + -0.8y) + 1.5y = 42

Combine like terms: -0.8y + 1.5y = 0.7y
28 + 0.7y = 42

Solving
28 + 0.7y = 42

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-28' to each side of the equation.
28 + -28 + 0.7y = 42 + -28

Combine like terms: 28 + -28 = 0
0 + 0.7y = 42 + -28
0.7y = 42 + -28

Combine like terms: 42 + -28 = 14
0.7y = 14

Divide each side by '0.7'.
y = 20

Simplifying
y = 20

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