X=(C-a)(b-3)

Solution for X=(C-a)(b-3) equation:

Simplifying
X = (C + -1a)(b + -3)

Reorder the terms:
X = (C + -1a)(-3 + b)

Multiply (C + -1a) * (-3 + b)
X = (C(-3 + b) + -1a * (-3 + b))
X = ((-3 * C + b * C) + -1a * (-3 + b))
X = ((-3C + bC) + -1a * (-3 + b))
X = (-3C + bC + (-3 * -1a + b * -1a))
X = (-3C + bC + (3a + -1ab))

Reorder the terms:
X = (-3C + 3a + -1ab + bC)
X = (-3C + 3a + -1ab + bC)

Solving
X = -3C + 3a + -1ab + bC

Solving for variable 'X'.

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

Simplifying
X = -3C + 3a + -1ab + bC