3(f-10)=-42

Solution for 3(f-10)=-42 equation:

Simplifying
3(f + -10) = -42

Reorder the terms:
3(-10 + f) = -42
(-10 * 3 + f * 3) = -42
(-30 + 3f) = -42

Solving
-30 + 3f = -42

Solving for variable 'f'.

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

Add '30' to each side of the equation.
-30 + 30 + 3f = -42 + 30

Combine like terms: -30 + 30 = 0
0 + 3f = -42 + 30
3f = -42 + 30

Combine like terms: -42 + 30 = -12
3f = -12

Divide each side by '3'.
f = -4

Simplifying
f = -4