Answer:
3
Explanation:
9y-18=3y
9y-3y=18
6y=18
y=18/6
y=3
First step : isolate the variable y
⇔ 9y-3y=18
⇔ 6y = 18
second step : calculate y
6y = 18 ⇔ y = 18/6 = 3
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