7(3-4x)=-21x

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Solution for 7(3-4x)=-21x equation:


Simplifying
7(3 + -4x) = -21x
(3 * 7 + -4x * 7) = -21x
(21 + -28x) = -21x

Solving
21 + -28x = -21x

Solving for variable 'x'.

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

Add '21x' to each side of the equation.
21 + -28x + 21x = -21x + 21x

Combine like terms: -28x + 21x = -7x
21 + -7x = -21x + 21x

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

Add '-21' to each side of the equation.
21 + -21 + -7x = 0 + -21

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

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

Divide each side by '-7'.
x = 3

Simplifying
x = 3

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