3y = 2x + 15
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It is: y = -4x+12
Yes and t = 1 in both equations
no.
Equivalent to what? "3x = 3 + x" is an equation which can be equivalent to other equations, but none is mentioned.
2x+7=3 is an equation. However, 2x=-4 is equivalent. So is x=-2. And an infinite number of others.