7(2a-5)=21

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Solution for 7(2a-5)=21 equation: 


Simplifying
7(2a + -5) = 21

Reorder the terms:
7(-5 + 2a) = 21
(-5 * 7 + 2a * 7) = 21
(-35 + 14a) = 21

Solving
-35 + 14a = 21

Solving for variable 'a'.

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

Add '35' to each side of the equation.
-35 + 35 + 14a = 21 + 35

Combine like terms: -35 + 35 = 0
0 + 14a = 21 + 35
14a = 21 + 35

Combine like terms: 21 + 35 = 56
14a = 56

Divide each side by '14'.
a = 4

Simplifying
a = 4

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