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y/4+4.7 = 8.2 // - 8.2
y/4-8.2+4.7 = 0
1/4*y-3.5 = 0 // + 3.5
1/4*y = 3.5 // : 1/4
y = 3.5/1/4
y = 14
y = 14
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