18a-21=16a-7

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Solution for 18a-21=16a-7 equation:


Simplifying
18a + -21 = 16a + -7

Reorder the terms:
-21 + 18a = 16a + -7

Reorder the terms:
-21 + 18a = -7 + 16a

Solving
-21 + 18a = -7 + 16a

Solving for variable 'a'.

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

Add '-16a' to each side of the equation.
-21 + 18a + -16a = -7 + 16a + -16a

Combine like terms: 18a + -16a = 2a
-21 + 2a = -7 + 16a + -16a

Combine like terms: 16a + -16a = 0
-21 + 2a = -7 + 0
-21 + 2a = -7

Add '21' to each side of the equation.
-21 + 21 + 2a = -7 + 21

Combine like terms: -21 + 21 = 0
0 + 2a = -7 + 21
2a = -7 + 21

Combine like terms: -7 + 21 = 14
2a = 14

Divide each side by '2'.
a = 7

Simplifying
a = 7

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