Răspuns :
7 × c = 350
c = 350 : 7
c = 50
a + c = 424
a + 50 = 424
a = 424 - 50
a = 374
a - b - c = 224
374 - b - 50 = 224
374 - b = 224 + 50
374 - b = 274
b = 374 - 274
b = 100
7 × c = 350
c = 350 : 7
c = 50
a + c = 424
a + 50 = 424
a = 424 - 50
a = 374
a - b - c = 224
374 - b - 50 = 224
374 - b = 224 + 50
374 - b = 274
b = 374 - 274
b = 100