3a+21=4a-60

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Solution for 3a+21=4a-60 equation:


Simplifying
3a + 21 = 4a + -60

Reorder the terms:
21 + 3a = 4a + -60

Reorder the terms:
21 + 3a = -60 + 4a

Solving
21 + 3a = -60 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
21 + 3a + -4a = -60 + 4a + -4a

Combine like terms: 3a + -4a = -1a
21 + -1a = -60 + 4a + -4a

Combine like terms: 4a + -4a = 0
21 + -1a = -60 + 0
21 + -1a = -60

Add '-21' to each side of the equation.
21 + -21 + -1a = -60 + -21

Combine like terms: 21 + -21 = 0
0 + -1a = -60 + -21
-1a = -60 + -21

Combine like terms: -60 + -21 = -81
-1a = -81

Divide each side by '-1'.
a = 81

Simplifying
a = 81

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