100-(20+14) = 100-34 = 66
b+ (12+40) = b+52
85 - (a+10) = 85 - a - 10 = 75 - a
300+ (200-100) = 300 + 100 = 400
b - 30 = b - 30
900 + (700 - 600) = 900 + 100 = 1000
600 - 200 - 100 = 300
78 + (d - 40) = 78+d-40 = 38 + d
