3(5-y)-4(5-y)=20

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Solution for 3(5-y)-4(5-y)=20 equation: 


Simplifying
3(5 + -1y) + -4(5 + -1y) = 20
(5 * 3 + -1y * 3) + -4(5 + -1y) = 20
(15 + -3y) + -4(5 + -1y) = 20
15 + -3y + (5 * -4 + -1y * -4) = 20
15 + -3y + (-20 + 4y) = 20

Reorder the terms:
15 + -20 + -3y + 4y = 20

Combine like terms: 15 + -20 = -5
-5 + -3y + 4y = 20

Combine like terms: -3y + 4y = 1y
-5 + 1y = 20

Solving
-5 + 1y = 20

Solving for variable 'y'.

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

Add '5' to each side of the equation.
-5 + 5 + 1y = 20 + 5

Combine like terms: -5 + 5 = 0
0 + 1y = 20 + 5
1y = 20 + 5

Combine like terms: 20 + 5 = 25
1y = 25

Divide each side by '1'.
y = 25

Simplifying
y = 25

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