Tolong jawab pake cara nomer12,14,15,16

14.) (38 x 2) + 24 + 30 + 18 = 148 cm

12. 75+2x+15+x = 180
90+3x = 180
3x = 180-90
3x = 90
X = 90/3
X = 30

14. ( 38×2 ) +24+30+18 = 148

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