10a-3a+4=2a-21

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Solution for 10a-3a+4=2a-21 equation:


Simplifying
10a + -3a + 4 = 2a + -21

Reorder the terms:
4 + 10a + -3a = 2a + -21

Combine like terms: 10a + -3a = 7a
4 + 7a = 2a + -21

Reorder the terms:
4 + 7a = -21 + 2a

Solving
4 + 7a = -21 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
4 + 7a + -2a = -21 + 2a + -2a

Combine like terms: 7a + -2a = 5a
4 + 5a = -21 + 2a + -2a

Combine like terms: 2a + -2a = 0
4 + 5a = -21 + 0
4 + 5a = -21

Add '-4' to each side of the equation.
4 + -4 + 5a = -21 + -4

Combine like terms: 4 + -4 = 0
0 + 5a = -21 + -4
5a = -21 + -4

Combine like terms: -21 + -4 = -25
5a = -25

Divide each side by '5'.
a = -5

Simplifying
a = -5

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