7x-3x=30

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Solution for 7x-3x=30 equation: 


Simplifying
7x + -3x = 30

Combine like terms: 7x + -3x = 4x
4x = 30

Solving
4x = 30

Solving for variable 'x'.

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

Divide each side by '4'.
x = 7.5

Simplifying
x = 7.5

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