0.3(x+40)+0.3x=21

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Solution for 0.3(x+40)+0.3x=21 equation: 


Simplifying
0.3(x + 40) + 0.3x = 21

Reorder the terms:
0.3(40 + x) + 0.3x = 21
(40 * 0.3 + x * 0.3) + 0.3x = 21
(12 + 0.3x) + 0.3x = 21

Combine like terms: 0.3x + 0.3x = 0.6x
12 + 0.6x = 21

Solving
12 + 0.6x = 21

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 0.6x = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 0.6x = 21 + -12
0.6x = 21 + -12

Combine like terms: 21 + -12 = 9
0.6x = 9

Divide each side by '0.6'.
x = 15

Simplifying
x = 15

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