0.4(x+20)+x=57

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Solution for 0.4(x+20)+x=57 equation: 


Simplifying
0.4(x + 20) + x = 57

Reorder the terms:
0.4(20 + x) + x = 57
(20 * 0.4 + x * 0.4) + x = 57
(8 + 0.4x) + x = 57

Combine like terms: 0.4x + x = 1.4x
8 + 1.4x = 57

Solving
8 + 1.4x = 57

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 + 1.4x = 57 + -8

Combine like terms: 8 + -8 = 0
0 + 1.4x = 57 + -8
1.4x = 57 + -8

Combine like terms: 57 + -8 = 49
1.4x = 49

Divide each side by '1.4'.
x = 35

Simplifying
x = 35

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