15 - 2y = 3y
Add 2y to each side to get:
15 = 5y
Divide both sides by 5 to get:
y = 3
Sorted :-)
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-2x plus 3y equals 1
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-3y + z = 12
It is a linear equation in one variable, y.
5y - 3y = 18 2y = 18 y = 18/2 y = 9