21-7x=-42

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Solution for 21-7x=-42 equation: 


Simplifying
21 + -7x = -42

Solving
21 + -7x = -42

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 + -7x = -42 + -21

Combine like terms: 21 + -21 = 0
0 + -7x = -42 + -21
-7x = -42 + -21

Combine like terms: -42 + -21 = -63
-7x = -63

Divide each side by '-7'.
x = 9

Simplifying
x = 9

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