51-3x=7x+21

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


Simplifying
51 + -3x = 7x + 21

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

Solving
51 + -3x = 21 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
51 + -3x + -7x = 21 + 7x + -7x

Combine like terms: -3x + -7x = -10x
51 + -10x = 21 + 7x + -7x

Combine like terms: 7x + -7x = 0
51 + -10x = 21 + 0
51 + -10x = 21

Add '-51' to each side of the equation.
51 + -51 + -10x = 21 + -51

Combine like terms: 51 + -51 = 0
0 + -10x = 21 + -51
-10x = 21 + -51

Combine like terms: 21 + -51 = -30
-10x = -30

Divide each side by '-10'.
x = 3

Simplifying
x = 3

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