3a-18+2=4a+8-21

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Solution for 3a-18+2=4a+8-21 equation:


Simplifying
3a + -18 + 2 = 4a + 8 + -21

Reorder the terms:
-18 + 2 + 3a = 4a + 8 + -21

Combine like terms: -18 + 2 = -16
-16 + 3a = 4a + 8 + -21

Reorder the terms:
-16 + 3a = 8 + -21 + 4a

Combine like terms: 8 + -21 = -13
-16 + 3a = -13 + 4a

Solving
-16 + 3a = -13 + 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.
-16 + 3a + -4a = -13 + 4a + -4a

Combine like terms: 3a + -4a = -1a
-16 + -1a = -13 + 4a + -4a

Combine like terms: 4a + -4a = 0
-16 + -1a = -13 + 0
-16 + -1a = -13

Add '16' to each side of the equation.
-16 + 16 + -1a = -13 + 16

Combine like terms: -16 + 16 = 0
0 + -1a = -13 + 16
-1a = -13 + 16

Combine like terms: -13 + 16 = 3
-1a = 3

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

Simplifying
a = -3

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