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(1/2 x ...) - 10 = 5 x 4 ----------------------> disini kita ubah ... menjadi Y
Y/2 - 10 = 20
Y/2 = 20 + 10
Y/2 = 30
Y = 60
1/2a - 10 = 20
1/2a = 20 + 10
1/2a = 20+10
1/2a = 30
a = 30 : 1/2
a = 30 x 2/1
a = 60