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robot : r
mobil: m
jadi Arman punya 5r+8m
diberi 2r dan memberi 3m
5r + 8m + 2r - 3m
yang variabilitas sama dijumlahkan
5r + 2r + 8m - 3m
= 7r + 5m
jadi 7 robot dan 5 mobil
5x+8x-(-2x+3y)
5x+8y+2x-3y
5x+2x+8y-3y
7x+5y
sisa mainan arman mempunyai 7 robot dan 5 mobil"an