4a+15=6a+21

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Solution for 4a+15=6a+21 equation:


Simplifying
4a + 15 = 6a + 21

Reorder the terms:
15 + 4a = 6a + 21

Reorder the terms:
15 + 4a = 21 + 6a

Solving
15 + 4a = 21 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
15 + 4a + -6a = 21 + 6a + -6a

Combine like terms: 4a + -6a = -2a
15 + -2a = 21 + 6a + -6a

Combine like terms: 6a + -6a = 0
15 + -2a = 21 + 0
15 + -2a = 21

Add '-15' to each side of the equation.
15 + -15 + -2a = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -2a = 21 + -15
-2a = 21 + -15

Combine like terms: 21 + -15 = 6
-2a = 6

Divide each side by '-2'.
a = -3

Simplifying
a = -3

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