21=-4a+7a

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


Simplifying
21 = -4a + 7a

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

Solving
21 = 3a

Solving for variable 'a'.

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

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

Combine like terms: 3a + -3a = 0
21 + -3a = 0

Add '-21' to each side of the equation.
21 + -21 + -3a = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3a = 0 + -21
-3a = 0 + -21

Combine like terms: 0 + -21 = -21
-3a = -21

Divide each side by '-3'.
a = 7

Simplifying
a = 7

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