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4x+10 + 2x+6 = 46
6x+16 = 46
6x = 46 - 16
x = 30:6 = 5
panjang = 2(5)+5 = 10+5 = 15cm
lebar = (5) + 3 = 8cm
2x + 5 + x+3 = 23
3x + 8 = 23
3x = 23 - 8 = 15
x = 15/3 = 5
panjang = 2 x 5 + 5 = 15
lebar = 5 + 3 = 8
maaf ya kalo salah :)