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keliling = 2(2x-1) + 2(3x+2)= 42
4x-2+6x+4 = 42
10x +2=42
x= 4
sisi pertama= 2x-1 = 2.4-1 =7cm
sisi kedua = 3.4+2 = 14 cm
2(2x-1)cm + 2(3x+2)cm. = 42
4x-2 + 6x+4 = 42
10x = 40
x = 4
sisi 1 = (2(4) -1)
sisi 2 = (3(4)+2)