40-4x=3x-9

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Solution for 40-4x=3x-9 equation:


Simplifying
40 + -4x = 3x + -9

Reorder the terms:
40 + -4x = -9 + 3x

Solving
40 + -4x = -9 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
40 + -4x + -3x = -9 + 3x + -3x

Combine like terms: -4x + -3x = -7x
40 + -7x = -9 + 3x + -3x

Combine like terms: 3x + -3x = 0
40 + -7x = -9 + 0
40 + -7x = -9

Add '-40' to each side of the equation.
40 + -40 + -7x = -9 + -40

Combine like terms: 40 + -40 = 0
0 + -7x = -9 + -40
-7x = -9 + -40

Combine like terms: -9 + -40 = -49
-7x = -49

Divide each side by '-7'.
x = 7

Simplifying
x = 7

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