100=2y-40

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Solution for 100=2y-40 equation:


Simplifying
100 = 2y + -40

Reorder the terms:
100 = -40 + 2y

Solving
100 = -40 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
100 + -2y = -40 + 2y + -2y

Combine like terms: 2y + -2y = 0
100 + -2y = -40 + 0
100 + -2y = -40

Add '-100' to each side of the equation.
100 + -100 + -2y = -40 + -100

Combine like terms: 100 + -100 = 0
0 + -2y = -40 + -100
-2y = -40 + -100

Combine like terms: -40 + -100 = -140
-2y = -140

Divide each side by '-2'.
y = 70

Simplifying
y = 70

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