3X+Y=X-2(Y)

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Solution for 3X+Y=X-2(Y) equation:


Simplifying
3X + Y = X + -2(Y)

Solving
3X + Y = X + -2Y

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
3X + -1X + Y = X + -1X + -2Y

Combine like terms: 3X + -1X = 2X
2X + Y = X + -1X + -2Y

Combine like terms: X + -1X = 0
2X + Y = 0 + -2Y
2X + Y = -2Y

Add '-1Y' to each side of the equation.
2X + Y + -1Y = -2Y + -1Y

Combine like terms: Y + -1Y = 0
2X + 0 = -2Y + -1Y
2X = -2Y + -1Y

Combine like terms: -2Y + -1Y = -3Y
2X = -3Y

Divide each side by '2'.
X = -1.5Y

Simplifying
X = -1.5Y

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