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kali silang
15 x 18 = 12(15+x)
270 = 180 + 12x
pindah ruas
270 - 180 = 12x
90 = 12x
90/12 = x
7,5 = x
2. x/9 = x+5/12
kali silang
12x = 9(x+5)
12x = 9x+45
pindah ruas
12x-9x = 45
3x = 45
x = 45/3
x= 15