21-3a=10a-5

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Solution for 21-3a=10a-5 equation:


Simplifying
21 + -3a = 10a + -5

Reorder the terms:
21 + -3a = -5 + 10a

Solving
21 + -3a = -5 + 10a

Solving for variable 'a'.

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

Add '-10a' to each side of the equation.
21 + -3a + -10a = -5 + 10a + -10a

Combine like terms: -3a + -10a = -13a
21 + -13a = -5 + 10a + -10a

Combine like terms: 10a + -10a = 0
21 + -13a = -5 + 0
21 + -13a = -5

Add '-21' to each side of the equation.
21 + -21 + -13a = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -13a = -5 + -21
-13a = -5 + -21

Combine like terms: -5 + -21 = -26
-13a = -26

Divide each side by '-13'.
a = 2

Simplifying
a = 2

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