0.2(x+40)+0.2x=12

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Solution for 0.2(x+40)+0.2x=12 equation: 


Simplifying
0.2(x + 40) + 0.2x = 12

Reorder the terms:
0.2(40 + x) + 0.2x = 12
(40 * 0.2 + x * 0.2) + 0.2x = 12
(8 + 0.2x) + 0.2x = 12

Combine like terms: 0.2x + 0.2x = 0.4x
8 + 0.4x = 12

Solving
8 + 0.4x = 12

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 + 0.4x = 12 + -8

Combine like terms: 8 + -8 = 0
0 + 0.4x = 12 + -8
0.4x = 12 + -8

Combine like terms: 12 + -8 = 4
0.4x = 4

Divide each side by '0.4'.
x = 10

Simplifying
x = 10

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