21-3x=5-7

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Solution for 21-3x=5-7 equation: 


Simplifying
21 + -3x = 5 + -7

Combine like terms: 5 + -7 = -2
21 + -3x = -2

Solving
21 + -3x = -2

Solving for variable 'x'.

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

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

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

Combine like terms: -2 + -21 = -23
-3x = -23

Divide each side by '-3'.
x = 7.666666667

Simplifying
x = 7.666666667

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