7x+21=-7(7-6x)

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Solution for 7x+21=-7(7-6x) equation:


Simplifying
7x + 21 = -7(7 + -6x)

Reorder the terms:
21 + 7x = -7(7 + -6x)
21 + 7x = (7 * -7 + -6x * -7)
21 + 7x = (-49 + 42x)

Solving
21 + 7x = -49 + 42x

Solving for variable 'x'.

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

Add '-42x' to each side of the equation.
21 + 7x + -42x = -49 + 42x + -42x

Combine like terms: 7x + -42x = -35x
21 + -35x = -49 + 42x + -42x

Combine like terms: 42x + -42x = 0
21 + -35x = -49 + 0
21 + -35x = -49

Add '-21' to each side of the equation.
21 + -21 + -35x = -49 + -21

Combine like terms: 21 + -21 = 0
0 + -35x = -49 + -21
-35x = -49 + -21

Combine like terms: -49 + -21 = -70
-35x = -70

Divide each side by '-35'.
x = 2

Simplifying
x = 2

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