7+3x-7x=-9

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Solution for 7+3x-7x=-9 equation: 


Simplifying
7 + 3x + -7x = -9

Combine like terms: 3x + -7x = -4x
7 + -4x = -9

Solving
7 + -4x = -9

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + -4x = -9 + -7

Combine like terms: 7 + -7 = 0
0 + -4x = -9 + -7
-4x = -9 + -7

Combine like terms: -9 + -7 = -16
-4x = -16

Divide each side by '-4'.
x = 4

Simplifying
x = 4

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