-21=-7(x-10)

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Solution for -21=-7(x-10) equation:


Simplifying
-21 = -7(x + -10)

Reorder the terms:
-21 = -7(-10 + x)
-21 = (-10 * -7 + x * -7)
-21 = (70 + -7x)

Solving
-21 = 70 + -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.
-21 + 7x = 70 + -7x + 7x

Combine like terms: -7x + 7x = 0
-21 + 7x = 70 + 0
-21 + 7x = 70

Add '21' to each side of the equation.
-21 + 21 + 7x = 70 + 21

Combine like terms: -21 + 21 = 0
0 + 7x = 70 + 21
7x = 70 + 21

Combine like terms: 70 + 21 = 91
7x = 91

Divide each side by '7'.
x = 13

Simplifying
x = 13

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