18a-20=15a-7

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Solution for 18a-20=15a-7 equation:


Simplifying
18a + -20 = 15a + -7

Reorder the terms:
-20 + 18a = 15a + -7

Reorder the terms:
-20 + 18a = -7 + 15a

Solving
-20 + 18a = -7 + 15a

Solving for variable 'a'.

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

Add '-15a' to each side of the equation.
-20 + 18a + -15a = -7 + 15a + -15a

Combine like terms: 18a + -15a = 3a
-20 + 3a = -7 + 15a + -15a

Combine like terms: 15a + -15a = 0
-20 + 3a = -7 + 0
-20 + 3a = -7

Add '20' to each side of the equation.
-20 + 20 + 3a = -7 + 20

Combine like terms: -20 + 20 = 0
0 + 3a = -7 + 20
3a = -7 + 20

Combine like terms: -7 + 20 = 13
3a = 13

Divide each side by '3'.
a = 4.333333333

Simplifying
a = 4.333333333

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