F+s+t=75

Solution for F+s+t=75 equation:

Simplifying
F + s + t = 75

Solving
F + s + t = 75

Solving for variable 'F'.

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

Add '-1s' to each side of the equation.
F + s + -1s + t = 75 + -1s

Combine like terms: s + -1s = 0
F + 0 + t = 75 + -1s
F + t = 75 + -1s

Add '-1t' to each side of the equation.
F + t + -1t = 75 + -1s + -1t

Combine like terms: t + -1t = 0
F + 0 = 75 + -1s + -1t
F = 75 + -1s + -1t

Simplifying
F = 75 + -1s + -1t