5a+7-4a=-21

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Solution for 5a+7-4a=-21 equation:


Simplifying
5a + 7 + -4a = -21

Reorder the terms:
7 + 5a + -4a = -21

Combine like terms: 5a + -4a = 1a
7 + 1a = -21

Solving
7 + 1a = -21

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 1a = -21 + -7

Combine like terms: 7 + -7 = 0
0 + 1a = -21 + -7
1a = -21 + -7

Combine like terms: -21 + -7 = -28
1a = -28

Divide each side by '1'.
a = -28

Simplifying
a = -28

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