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80 = 5x + 15
80 - 15 = 5x
65 = 5x
13 = x
* hasil = 40 : 16 = 5 : 2
2. 2x + 4 : 72 = 4 : 9 (kali silang) >> (2x + 4) x 9 dan 72 x 4
18x + 36 = 288
18x = 288 - 36
18x = 252
x = 14
* hasil = 32 : 72 = 4 : 9