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

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Solution for -28=-7(3x+4)+21 equation:


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

Reorder the terms:
-28 = -7(4 + 3x) + 21
-28 = (4 * -7 + 3x * -7) + 21
-28 = (-28 + -21x) + 21

Reorder the terms:
-28 = -28 + 21 + -21x

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

Solving
-28 = -7 + -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.
-28 + 21x = -7 + -21x + 21x

Combine like terms: -21x + 21x = 0
-28 + 21x = -7 + 0
-28 + 21x = -7

Add '28' to each side of the equation.
-28 + 28 + 21x = -7 + 28

Combine like terms: -28 + 28 = 0
0 + 21x = -7 + 28
21x = -7 + 28

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

Divide each side by '21'.
x = 1

Simplifying
x = 1

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