3x+21=2x+40

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Solution for 3x+21=2x+40 equation:


Simplifying
3x + 21 = 2x + 40

Reorder the terms:
21 + 3x = 2x + 40

Reorder the terms:
21 + 3x = 40 + 2x

Solving
21 + 3x = 40 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + 3x + -2x = 40 + 2x + -2x

Combine like terms: 3x + -2x = 1x
21 + 1x = 40 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + 1x = 40 + 0
21 + 1x = 40

Add '-21' to each side of the equation.
21 + -21 + 1x = 40 + -21

Combine like terms: 21 + -21 = 0
0 + 1x = 40 + -21
1x = 40 + -21

Combine like terms: 40 + -21 = 19
1x = 19

Divide each side by '1'.
x = 19

Simplifying
x = 19

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