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3x+1+2x+2x+2 = 7x + 3 :333
9x² + 6x + 1 = 4x² + 4x² + 8x + 4
9x² + 6x + 1 = 8x² + 8x + 4
x² - 2x - 3 = 0
(x - 3)(x + 1) = 0
x = 3 atau x = - 1
ambil x = 3 maka sisi-sisinya:
10, 6 dan 8
Keliling = 6 + 8 + 10 = 24 cm
Luas = (6 x 8)/2 = 24 cm²