5.5x+7x=40

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Solution for 5.5x+7x=40 equation: 


Simplifying
5.5x + 7x = 40

Combine like terms: 5.5x + 7x = 12.5x
12.5x = 40

Solving
12.5x = 40

Solving for variable 'x'.

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

Divide each side by '12.5'.
x = 3.2

Simplifying
x = 3.2

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