3x+28=4x+21

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Solution for 3x+28=4x+21 equation:


Simplifying
3x + 28 = 4x + 21

Reorder the terms:
28 + 3x = 4x + 21

Reorder the terms:
28 + 3x = 21 + 4x

Solving
28 + 3x = 21 + 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.
28 + 3x + -4x = 21 + 4x + -4x

Combine like terms: 3x + -4x = -1x
28 + -1x = 21 + 4x + -4x

Combine like terms: 4x + -4x = 0
28 + -1x = 21 + 0
28 + -1x = 21

Add '-28' to each side of the equation.
28 + -28 + -1x = 21 + -28

Combine like terms: 28 + -28 = 0
0 + -1x = 21 + -28
-1x = 21 + -28

Combine like terms: 21 + -28 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7

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