10y=15
y=1.5
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10y + 8y = 18y = 15 y = 15/18 y = 5/6 = 0.833333.....
you have to bring the "y" to one side. 10y - 6 = 2 + 4y 10y-4y = 2 + 6 6y = 8 y = 8/6 If you substitute 8/6 into y you will find that 8/6 is the answer
2y-10y
10y-4y = 6