20=3(y+4)-7y

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Solution for 20=3(y+4)-7y equation: 


Simplifying
20 = 3(y + 4) + -7y

Reorder the terms:
20 = 3(4 + y) + -7y
20 = (4 * 3 + y * 3) + -7y
20 = (12 + 3y) + -7y

Combine like terms: 3y + -7y = -4y
20 = 12 + -4y

Solving
20 = 12 + -4y

Solving for variable 'y'.

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

Add '4y' to each side of the equation.
20 + 4y = 12 + -4y + 4y

Combine like terms: -4y + 4y = 0
20 + 4y = 12 + 0
20 + 4y = 12

Add '-20' to each side of the equation.
20 + -20 + 4y = 12 + -20

Combine like terms: 20 + -20 = 0
0 + 4y = 12 + -20
4y = 12 + -20

Combine like terms: 12 + -20 = -8
4y = -8

Divide each side by '4'.
y = -2

Simplifying
y = -2

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