2x+7-4=21

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Solution for 2x+7-4=21 equation: 


Simplifying
2x + 7 + -4 = 21

Reorder the terms:
7 + -4 + 2x = 21

Combine like terms: 7 + -4 = 3
3 + 2x = 21

Solving
3 + 2x = 21

Solving for variable 'x'.

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

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

Combine like terms: 3 + -3 = 0
0 + 2x = 21 + -3
2x = 21 + -3

Combine like terms: 21 + -3 = 18
2x = 18

Divide each side by '2'.
x = 9

Simplifying
x = 9

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