3(180-y)=2(90)-y

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Solution for 3(180-y)=2(90)-y equation:


Simplifying
3(180 + -1y) = 2(90) + -1y
(180 * 3 + -1y * 3) = 2(90) + -1y
(540 + -3y) = 2(90) + -1y

Multiply 2 * 90
540 + -3y = 180 + -1y

Solving
540 + -3y = 180 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
540 + -3y + y = 180 + -1y + y

Combine like terms: -3y + y = -2y
540 + -2y = 180 + -1y + y

Combine like terms: -1y + y = 0
540 + -2y = 180 + 0
540 + -2y = 180

Add '-540' to each side of the equation.
540 + -540 + -2y = 180 + -540

Combine like terms: 540 + -540 = 0
0 + -2y = 180 + -540
-2y = 180 + -540

Combine like terms: 180 + -540 = -360
-2y = -360

Divide each side by '-2'.
y = 180

Simplifying
y = 180

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