15x+21=12+3

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Solution for 15x+21=12+3 equation: 


Simplifying
15x + 21 = 12 + 3

Reorder the terms:
21 + 15x = 12 + 3

Combine like terms: 12 + 3 = 15
21 + 15x = 15

Solving
21 + 15x = 15

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 15x = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 15x = 15 + -21
15x = 15 + -21

Combine like terms: 15 + -21 = -6
15x = -6

Divide each side by '15'.
x = -0.4

Simplifying
x = -0.4

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