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umur budi = ub
ua - 7 = 6(ub-7)
maka ua = 6ub -42+7
ua = 6ub - 35
2(ua+4) = 5(ub+4) +9
2(6ub - 35 +4 ) = 5ub + 20 + 9
12 ub - 62 = 5ub + 29
7 ub = 91
ub = 13
ua = 6ub - 35
ua = 6.13 - 35
ua = 43