40-2y=7

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Solution for 40-2y=7 equation: 


Simplifying
40 + -2y = 7

Solving
40 + -2y = 7

Solving for variable 'y'.

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

Add '-40' to each side of the equation.
40 + -40 + -2y = 7 + -40

Combine like terms: 40 + -40 = 0
0 + -2y = 7 + -40
-2y = 7 + -40

Combine like terms: 7 + -40 = -33
-2y = -33

Divide each side by '-2'.
y = 16.5

Simplifying
y = 16.5

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