7x+2x-4x=20

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Solution for 7x+2x-4x=20 equation: 


Simplifying
7x + 2x + -4x = 20

Combine like terms: 7x + 2x = 9x
9x + -4x = 20

Combine like terms: 9x + -4x = 5x
5x = 20

Solving
5x = 20

Solving for variable 'x'.

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

Divide each side by '5'.
x = 4

Simplifying
x = 4

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