0.4(x+20)+1.2x=72

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Solution for 0.4(x+20)+1.2x=72 equation: 


Simplifying
0.4(x + 20) + 1.2x = 72

Reorder the terms:
0.4(20 + x) + 1.2x = 72
(20 * 0.4 + x * 0.4) + 1.2x = 72
(8 + 0.4x) + 1.2x = 72

Combine like terms: 0.4x + 1.2x = 1.6x
8 + 1.6x = 72

Solving
8 + 1.6x = 72

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 1.6x = 72 + -8

Combine like terms: 8 + -8 = 0
0 + 1.6x = 72 + -8
1.6x = 72 + -8

Combine like terms: 72 + -8 = 64
1.6x = 64

Divide each side by '1.6'.
x = 40

Simplifying
x = 40

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