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 for easier multiplication:
K = -2 + 2a + -1(2b) + -3(a * b)

Remove parenthesis around (2b)
K = -2 + 2a + -1 * 2b + -3(a * b)

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

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

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

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

Solving for variable 'K'.

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

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