5(a+3)=21-3(1-21)

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Solution for 5(a+3)=21-3(1-21) equation:


Simplifying
5(a + 3) = 21 + -3(1 + -21)

Reorder the terms:
5(3 + a) = 21 + -3(1 + -21)
(3 * 5 + a * 5) = 21 + -3(1 + -21)
(15 + 5a) = 21 + -3(1 + -21)

Combine like terms: 1 + -21 = -20
15 + 5a = 21 + -3(-20)

Multiply -3 * -20
15 + 5a = 21 + 60

Combine like terms: 21 + 60 = 81
15 + 5a = 81

Solving
15 + 5a = 81

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + 5a = 81 + -15

Combine like terms: 15 + -15 = 0
0 + 5a = 81 + -15
5a = 81 + -15

Combine like terms: 81 + -15 = 66
5a = 66

Divide each side by '5'.
a = 13.2

Simplifying
a = 13.2

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