3(5x+8)=-42+21

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Solution for 3(5x+8)=-42+21 equation:


Simplifying
3(5x + 8) = -42 + 21

Reorder the terms:
3(8 + 5x) = -42 + 21
(8 * 3 + 5x * 3) = -42 + 21
(24 + 15x) = -42 + 21

Combine like terms: -42 + 21 = -21
24 + 15x = -21

Solving
24 + 15x = -21

Solving for variable 'x'.

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

Add '-24' to each side of the equation.
24 + -24 + 15x = -21 + -24

Combine like terms: 24 + -24 = 0
0 + 15x = -21 + -24
15x = -21 + -24

Combine like terms: -21 + -24 = -45
15x = -45

Divide each side by '15'.
x = -3

Simplifying
x = -3

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