F=4c*(-5)*(-3a)*7b

Solution for F=4c*(-5)*(-3a)*7b equation:

Simplifying
F = 4c(-5)(-3a) * 7b

Remove parenthesis around (-3a)
F = 4c * -5 * -3a * 7b

Reorder the terms for easier multiplication:
F = 4 * -5 * -3 * 7c * a * b

Multiply 4 * -5
F = -20 * -3 * 7c * a * b

Multiply -20 * -3
F = 60 * 7c * a * b

Multiply 60 * 7
F = 420c * a * b

Multiply c * a
F = 420ac * b

Multiply ac * b
F = 420abc

Solving
F = 420abc

Solving for variable 'F'.

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

Simplifying
F = 420abc