Răspuns :
575 - b x 32 - 45 = 50
575 - b x 32 = 50 + 45
575 - b x 32 = 95
b x 32 = 575 - 95
b x 32 = 480
b = 480 : 32
b = 15
575 - b x 32 = 50 + 45
575 - b x 32 = 95
b x 32 = 575 - 95
b x 32 = 480
b = 480 : 32
b = 15