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(x + 10) 10
---------- = ------ ( kali silang oke)
(12+8) 8
8 kali ayun (x + 10) = 10 kali 20
8x+ 80 = 200
8x = 200 - 80 (disini 80 nya dipindahin ke kanan, simbol berubah nya jadi min)
8x = 120
x = 120
---- ( 8 nya dipindahin ke kanan jd simbol pembagian)
8
x = 15 ( ini hasil dari x )
y 7
---------- = ----- (kali silang oke)
(12 + 8) 8
8y = 7 kali 20
8y = 140
y = 140
-------
8
y = 15,25 ( ini hasil akhir)