y=.5(x-3)(X+1)

Solution for y=.5(x-3)(X+1) equation:

Simplifying
y = 0.5(x + -3)(X + 1)

Reorder the terms:
y = 0.5(-3 + x)(X + 1)

Reorder the terms:
y = 0.5(-3 + x)(1 + X)

Multiply (-3 + x) * (1 + X)
y = 0.5(-3(1 + X) + x(1 + X))
y = 0.5((1 * -3 + X * -3) + x(1 + X))
y = 0.5((-3 + -3X) + x(1 + X))
y = 0.5(-3 + -3X + (1 * x + X * x))
y = 0.5(-3 + -3X + (1x + xX))
y = 0.5(-3 + -3X + 1x + xX)
y = (-3 * 0.5 + -3X * 0.5 + 1x * 0.5 + xX * 0.5)
y = (-1.5 + -1.5X + 0.5x + 0.5xX)

Solving
y = -1.5 + -1.5X + 0.5x + 0.5xX

Solving for variable 'y'.

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

Simplifying
y = -1.5 + -1.5X + 0.5x + 0.5xX