.3x+.4x=90

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Solution for .3x+.4x=90 equation: 


Simplifying
0.3x + 0.4x = 90

Combine like terms: 0.3x + 0.4x = 0.7x
0.7x = 90

Solving
0.7x = 90

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 = 128.5714286

Simplifying
x = 128.5714286

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