0.50x+0.20(0.9-x)=4.20

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Solution for 0.50x+0.20(0.9-x)=4.20 equation: 


Simplifying
0.50x + 0.20(0.9 + -1x) = 4.20
0.50x + (0.9 * 0.20 + -1x * 0.20) = 4.20
0.50x + (0.18 + -0.2x) = 4.20

Reorder the terms:
0.18 + 0.50x + -0.2x = 4.20

Combine like terms: 0.50x + -0.2x = 0.3x
0.18 + 0.3x = 4.20

Solving
0.18 + 0.3x = 4.20

Solving for variable 'x'.

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

Add '-0.18' to each side of the equation.
0.18 + -0.18 + 0.3x = 4.20 + -0.18

Combine like terms: 0.18 + -0.18 = 0.00
0.00 + 0.3x = 4.20 + -0.18
0.3x = 4.20 + -0.18

Combine like terms: 4.20 + -0.18 = 4.02
0.3x = 4.02

Divide each side by '0.3'.
x = 13.4

Simplifying
x = 13.4

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