0.5x+0.20x=4.20

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Solution for 0.5x+0.20x=4.20 equation: 


Simplifying
0.5x + 0.20x = 4.20

Combine like terms: 0.5x + 0.20x = 0.7x
0.7x = 4.20

Solving
0.7x = 4.20

Solving for variable 'x'.

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

Divide each side by '0.7'.
x = 6

Simplifying
x = 6

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