15a+12=11a-21

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Solution for 15a+12=11a-21 equation:


Simplifying
15a + 12 = 11a + -21

Reorder the terms:
12 + 15a = 11a + -21

Reorder the terms:
12 + 15a = -21 + 11a

Solving
12 + 15a = -21 + 11a

Solving for variable 'a'.

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

Add '-11a' to each side of the equation.
12 + 15a + -11a = -21 + 11a + -11a

Combine like terms: 15a + -11a = 4a
12 + 4a = -21 + 11a + -11a

Combine like terms: 11a + -11a = 0
12 + 4a = -21 + 0
12 + 4a = -21

Add '-12' to each side of the equation.
12 + -12 + 4a = -21 + -12

Combine like terms: 12 + -12 = 0
0 + 4a = -21 + -12
4a = -21 + -12

Combine like terms: -21 + -12 = -33
4a = -33

Divide each side by '4'.
a = -8.25

Simplifying
a = -8.25

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