7x-51-3x=21

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Solution for 7x-51-3x=21 equation:


Simplifying
7x + -51 + -3x = 21

Reorder the terms:
-51 + 7x + -3x = 21

Combine like terms: 7x + -3x = 4x
-51 + 4x = 21

Solving
-51 + 4x = 21

Solving for variable 'x'.

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

Add '51' to each side of the equation.
-51 + 51 + 4x = 21 + 51

Combine like terms: -51 + 51 = 0
0 + 4x = 21 + 51
4x = 21 + 51

Combine like terms: 21 + 51 = 72
4x = 72

Divide each side by '4'.
x = 18

Simplifying
x = 18

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