K=2*(a-1)-(b-2)-3*(a*b)

Solution for K=2*(a-1)-(b-2)-3*(a*b) equation:

Simplifying
K = 2(a + -1) + -1(b + -2) + -3(a * b)

Reorder the terms:
K = 2(-1 + a) + -1(b + -2) + -3(a * b)
K = (-1 * 2 + a * 2) + -1(b + -2) + -3(a * b)
K = (-2 + 2a) + -1(b + -2) + -3(a * b)

Reorder the terms:
K = -2 + 2a + -1(-2 + b) + -3(a * b)
K = -2 + 2a + (-2 * -1 + b * -1) + -3(a * b)
K = -2 + 2a + (2 + -1b) + -3(a * b)

Multiply a * b
K = -2 + 2a + 2 + -1b + -3(ab)

Reorder the terms:
K = -2 + 2 + 2a + -3ab + -1b

Combine like terms: -2 + 2 = 0
K = 0 + 2a + -3ab + -1b
K = 2a + -3ab + -1b

Solving
K = 2a + -3ab + -1b

Solving for variable 'K'.

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

Simplifying
K = 2a + -3ab + -1b