[tex]a = adi \\ b = budi \\ \\ Umur \: adi \\ b + a= 43 \\ b - a = \: \: 7 \\ .................. - \\ \: \: \: \: \: \: 2a = 36 \\ \: \: \: \: \: \: \: \: a = 18 \\ \\ Umur \: budi \\ b + a = 43 \\ \: \: \: \: \: \: \: \: a = 18 \\ ................... - \\ b \: \: \: \: \: \: \: \: = 25 \\ \\ adi \: \: = 18 \: tahun \\ budi = 25 \: tahun[/tex]
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[tex]a = adi \\ b = budi \\ \\ Umur \: adi \\ b + a= 43 \\ b - a = \: \: 7 \\ .................. - \\ \: \: \: \: \: \: 2a = 36 \\ \: \: \: \: \: \: \: \: a = 18 \\ \\ Umur \: budi \\ b + a = 43 \\ \: \: \: \: \: \: \: \: a = 18 \\ ................... - \\ b \: \: \: \: \: \: \: \: = 25 \\ \\ adi \: \: = 18 \: tahun \\ budi = 25 \: tahun[/tex]