21=-5(7x+8)

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


Simplifying
21 = -5(7x + 8)

Reorder the terms:
21 = -5(8 + 7x)
21 = (8 * -5 + 7x * -5)
21 = (-40 + -35x)

Solving
21 = -40 + -35x

Solving for variable 'x'.

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

Add '35x' to each side of the equation.
21 + 35x = -40 + -35x + 35x

Combine like terms: -35x + 35x = 0
21 + 35x = -40 + 0
21 + 35x = -40

Add '-21' to each side of the equation.
21 + -21 + 35x = -40 + -21

Combine like terms: 21 + -21 = 0
0 + 35x = -40 + -21
35x = -40 + -21

Combine like terms: -40 + -21 = -61
35x = -61

Divide each side by '35'.
x = -1.742857143

Simplifying
x = -1.742857143

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