4(5)=y-20

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


Simplifying
4(5) = y + -20

Multiply 4 * 5
20 = y + -20

Reorder the terms:
20 = -20 + y

Solving
20 = -20 + y

Solving for variable 'y'.

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

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

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

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

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

Combine like terms: -20 + -20 = -40
-1y = -40

Divide each side by '-1'.
y = 40

Simplifying
y = 40

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