40-3a=10-a

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Solution for 40-3a=10-a equation:


Simplifying
40 + -3a = 10 + -1a

Solving
40 + -3a = 10 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
40 + -3a + a = 10 + -1a + a

Combine like terms: -3a + a = -2a
40 + -2a = 10 + -1a + a

Combine like terms: -1a + a = 0
40 + -2a = 10 + 0
40 + -2a = 10

Add '-40' to each side of the equation.
40 + -40 + -2a = 10 + -40

Combine like terms: 40 + -40 = 0
0 + -2a = 10 + -40
-2a = 10 + -40

Combine like terms: 10 + -40 = -30
-2a = -30

Divide each side by '-2'.
a = 15

Simplifying
a = 15

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