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l = x + 7
K = 80 cm
K = 2(p + l)
80 = 2(2x - 3 + x + 7)
40 = 2x - 3 + x + 7
40 = 3x + 4
3x = 40 - 4
3x = 36
x = 12
Jadi nilai x adalah 12.
80 cm = 2. (2x-3+x+7)
80:2 = 3x + 4
40 = 3x +4
40 - 4 = 3x
36 = 3x
36 :3 = x
12 = x
Semoga Membantu :)