39=4y-45

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Solution for 39=4y-45 equation:


Simplifying
39 = 4y + -45

Reorder the terms:
39 = -45 + 4y

Solving
39 = -45 + 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.
39 + -4y = -45 + 4y + -4y

Combine like terms: 4y + -4y = 0
39 + -4y = -45 + 0
39 + -4y = -45

Add '-39' to each side of the equation.
39 + -39 + -4y = -45 + -39

Combine like terms: 39 + -39 = 0
0 + -4y = -45 + -39
-4y = -45 + -39

Combine like terms: -45 + -39 = -84
-4y = -84

Divide each side by '-4'.
y = 21

Simplifying
y = 21

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