1/2a(6a-8y+4z)
3/4b(4a-2b)
12
0
3/4(4a-2b)
99
3⁴ × 9n+¹÷(3x-¹×9n-¹)
(2x+3)-(3x+5)
(8p-7)-(-10p+5)
10 - 9 \times 5 + 6 \times (-2)
(4x+6)-(x+2)
