-21=-7(3-x)

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Solution for -21=-7(3-x) equation:


Simplifying
-21 = -7(3 + -1x)
-21 = (3 * -7 + -1x * -7)
-21 = (-21 + 7x)

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

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

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

Solving
0 = 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.
0 + -7x = 7x + -7x
Remove the zero:
-7x = 7x + -7x

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

Divide each side by '-7'.
x = 0

Simplifying
x = 0

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