15=-5(4+5)+21x

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Solution for 15=-5(4+5)+21x equation: 


Simplifying
15 = -5(4 + 5) + 21x

Combine like terms: 4 + 5 = 9
15 = -5(9) + 21x

Multiply -5 * 9
15 = -45 + 21x

Solving
15 = -45 + 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.
15 + -21x = -45 + 21x + -21x

Combine like terms: 21x + -21x = 0
15 + -21x = -45 + 0
15 + -21x = -45

Add '-15' to each side of the equation.
15 + -15 + -21x = -45 + -15

Combine like terms: 15 + -15 = 0
0 + -21x = -45 + -15
-21x = -45 + -15

Combine like terms: -45 + -15 = -60
-21x = -60

Divide each side by '-21'.
x = 2.857142857

Simplifying
x = 2.857142857

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