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90=12x+6
12x=84
x=7
sudut A=4x+7=4(7)+7=35
sudutC= 8x-1=8(7)-1=55
12x-6=90
12x=84
x=84/12
x=7
sdt A=4x+7=4.7+7=28+7=35derajat
sdtC=8x-1=8.7-1=56-1=55derajat