3(10-4x)=-42

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Solution for 3(10-4x)=-42 equation: 


Simplifying
3(10 + -4x) = -42
(10 * 3 + -4x * 3) = -42
(30 + -12x) = -42

Solving
30 + -12x = -42

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + -12x = -42 + -30

Combine like terms: 30 + -30 = 0
0 + -12x = -42 + -30
-12x = -42 + -30

Combine like terms: -42 + -30 = -72
-12x = -72

Divide each side by '-12'.
x = 6

Simplifying
x = 6

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