40-2a=100

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Solution for 40-2a=100 equation: 


Simplifying
40 + -2a = 100

Solving
40 + -2a = 100

Solving for variable 'a'.

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

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

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

Combine like terms: 100 + -40 = 60
-2a = 60

Divide each side by '-2'.
a = -30

Simplifying
a = -30

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