3(10-y)-2y=20

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Solution for 3(10-y)-2y=20 equation: 


Simplifying
3(10 + -1y) + -2y = 20
(10 * 3 + -1y * 3) + -2y = 20
(30 + -3y) + -2y = 20

Combine like terms: -3y + -2y = -5y
30 + -5y = 20

Solving
30 + -5y = 20

Solving for variable 'y'.

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

Add '-30' to each side of the equation.
30 + -30 + -5y = 20 + -30

Combine like terms: 30 + -30 = 0
0 + -5y = 20 + -30
-5y = 20 + -30

Combine like terms: 20 + -30 = -10
-5y = -10

Divide each side by '-5'.
y = 2

Simplifying
y = 2

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