5a+7+2a=21

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Solution for 5a+7+2a=21 equation: 


Simplifying
5a + 7 + 2a = 21

Reorder the terms:
7 + 5a + 2a = 21

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

Solving
7 + 7a = 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 + 7a = 21 + -7

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

Combine like terms: 21 + -7 = 14
7a = 14

Divide each side by '7'.
a = 2

Simplifying
a = 2

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