x+3=x-y*2

Solution for x+3=x-y*2 equation:

Simplifying
x + 3 = x + -1y * 2

Reorder the terms:
3 + x = x + -1y * 2

Reorder the terms for easier multiplication:
3 + x = x + -1 * 2y

Multiply -1 * 2
3 + x = x + -2y

Add '-1x' to each side of the equation.
3 + x + -1x = x + -1x + -2y

Combine like terms: x + -1x = 0
3 + 0 = x + -1x + -2y
3 = x + -1x + -2y

Combine like terms: x + -1x = 0
3 = 0 + -2y
3 = -2y

Solving
3 = -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
3 + 2y = -2y + 2y

Combine like terms: -2y + 2y = 0
3 + 2y = 0

Add '-3' to each side of the equation.
3 + -3 + 2y = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2y = 0 + -3
2y = 0 + -3

Combine like terms: 0 + -3 = -3
2y = -3

Divide each side by '2'.
y = -1.5

Simplifying
y = -1.5