21=7(3x-5)+7(x+8)

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Solution for 21=7(3x-5)+7(x+8) equation:


Simplifying
21 = 7(3x + -5) + 7(x + 8)

Reorder the terms:
21 = 7(-5 + 3x) + 7(x + 8)
21 = (-5 * 7 + 3x * 7) + 7(x + 8)
21 = (-35 + 21x) + 7(x + 8)

Reorder the terms:
21 = -35 + 21x + 7(8 + x)
21 = -35 + 21x + (8 * 7 + x * 7)
21 = -35 + 21x + (56 + 7x)

Reorder the terms:
21 = -35 + 56 + 21x + 7x

Combine like terms: -35 + 56 = 21
21 = 21 + 21x + 7x

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

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

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

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

Solving
0 = 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.
0 + -28x = 28x + -28x
Remove the zero:
-28x = 28x + -28x

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

Divide each side by '-28'.
x = 0

Simplifying
x = 0

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