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

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


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

Combine like terms: 3x + 4x = 7x
-28 = -7(7x) + 21x

Remove parenthesis around (7x)
-28 = -7 * 7x + 21x

Multiply -7 * 7
-28 = -49x + 21x

Combine like terms: -49x + 21x = -28x
-28 = -28x

Solving
-28 = -28x

Solving for variable 'x'.

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

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

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

Add '28' to each side of the equation.
-28 + 28 + 28x = 0 + 28

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

Combine like terms: 0 + 28 = 28
28x = 28

Divide each side by '28'.
x = 1

Simplifying
x = 1

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