Simplifying fg + -9n = 10j Solving fg + -9n = 10j Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '9n' to each side of the equation. fg + -9n + 9n = 10j + 9n Combine like terms: -9n + 9n = 0 fg + 0 = 10j + 9n fg = 10j + 9n Divide each side by 'g'. f = 10g-1j + 9g-1n Simplifying f = 10g-1j + 9g-1n