15y-11y=27-28
4y=-1
y=-(1/4)
15y+28=11y+27
4y=-1 /:4
y=-1/4
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15y-11y=27-28
4y=-1
y=-(1/4)
15y+28=11y+27
15y-11y=27-28
4y=-1 /:4
y=-1/4