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4y-9 = 15 4y = 15+9 4y = 24 y = 6
10y-3=4y+6 10y = 4y + 9 6y = 9 y = 9/6 y = 3/2 y = 1.5
4y + 10 = 22 4y - 10 - 10 4y=12 4y 4y 4y=3
4y + 9The variable is Y. The variable is the letter (the unknown amount)
If y + 3y + 10 = 70, then 4y + 10 = 70, and 4y = 60. We then find that y = 60/4 = 15.