7a-10-9a=-13

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Solution for 7a-10-9a=-13 equation:


Simplifying
7a + -10 + -9a = -13

Reorder the terms:
-10 + 7a + -9a = -13

Combine like terms: 7a + -9a = -2a
-10 + -2a = -13

Solving
-10 + -2a = -13

Solving for variable 'a'.

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

Add '10' to each side of the equation.
-10 + 10 + -2a = -13 + 10

Combine like terms: -10 + 10 = 0
0 + -2a = -13 + 10
-2a = -13 + 10

Combine like terms: -13 + 10 = -3
-2a = -3

Divide each side by '-2'.
a = 1.5

Simplifying
a = 1.5

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