3x+21=4x+24

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Solution for 3x+21=4x+24 equation:


Simplifying
3x + 21 = 4x + 24

Reorder the terms:
21 + 3x = 4x + 24

Reorder the terms:
21 + 3x = 24 + 4x

Solving
21 + 3x = 24 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
21 + 3x + -4x = 24 + 4x + -4x

Combine like terms: 3x + -4x = -1x
21 + -1x = 24 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + -1x = 24 + 0
21 + -1x = 24

Add '-21' to each side of the equation.
21 + -21 + -1x = 24 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 24 + -21
-1x = 24 + -21

Combine like terms: 24 + -21 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

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