.4x+.3x=4.2

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Solution for .4x+.3x=4.2 equation: 


Simplifying
0.4x + 0.3x = 4.2

Combine like terms: 0.4x + 0.3x = 0.7x
0.7x = 4.2

Solving
0.7x = 4.2

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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