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15(1/3x+2/5x)=22*15 (kedua ruas dikali 15)
5x+6x=330
11x=330
x=330/11
x=30
2.)x-1/2-2=2
x=2+1/2+2(pindah ruas)(negatif menjadi positif)
x=5/2
himpunan={5/2}