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Langkah 1 Expand the given equations to simplify them: (x + y)(x + z) = 15 → x² + xy + xz+ yz = 15 (y+ z)(y+ x) = 18 → y² + xy + xz + yz = 18 (z+æ)(z+y) = 30 → z² + xy + xz + yz = 30 Langkah 2 Subtract the first equation from the second and third equations to eliminate æ: y² - x² =3 z² - x² = 15 Langkah 3 Factor the above equations to get: (y- x)(y+ x) = 3 (z- x)(z+ x) = 15 Langkah 4 Solve the system of equations: From Step 3, we have y - x = 1 and y + x =3, solving gives y = 2 and x = 1 From Step 3, we have z - x = 3 and z + x = 5, solving gives z = 4 and x = 1 Jawaban Akhir x = 1,y = 2, z =4