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21 + 20(1-y) = 8(1/3 -2y)
lalu yg dlm kurung di substitusikan. menjadi :
21 + 20 - 20y = 8/3 - 16 y
20y -16y = 41 - 8/3
4y = 41-8/3
dikalikan 3 semua, jadi :
12y = 123-8
12y = 115
y = 115/12