3(a+21)=60

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Solution for 3(a+21)=60 equation: 


Simplifying
3(a + 21) = 60

Reorder the terms:
3(21 + a) = 60
(21 * 3 + a * 3) = 60
(63 + 3a) = 60

Solving
63 + 3a = 60

Solving for variable 'a'.

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

Add '-63' to each side of the equation.
63 + -63 + 3a = 60 + -63

Combine like terms: 63 + -63 = 0
0 + 3a = 60 + -63
3a = 60 + -63

Combine like terms: 60 + -63 = -3
3a = -3

Divide each side by '3'.
a = -1

Simplifying
a = -1

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