126-4x=3x+21

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Solution for 126-4x=3x+21 equation:


Simplifying
126 + -4x = 3x + 21

Reorder the terms:
126 + -4x = 21 + 3x

Solving
126 + -4x = 21 + 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.
126 + -4x + -3x = 21 + 3x + -3x

Combine like terms: -4x + -3x = -7x
126 + -7x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
126 + -7x = 21 + 0
126 + -7x = 21

Add '-126' to each side of the equation.
126 + -126 + -7x = 21 + -126

Combine like terms: 126 + -126 = 0
0 + -7x = 21 + -126
-7x = 21 + -126

Combine like terms: 21 + -126 = -105
-7x = -105

Divide each side by '-7'.
x = 15

Simplifying
x = 15

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