Răspuns :
x x+2
7 + 7 = 2450
x 2
7 ( 1+ 7 ) = 2450
x
7 (1+49) = 2450
x
7 = 2450/50 = 49
x 2
7 = 7 ⇒ x=2
7 + 7 = 2450
x 2
7 ( 1+ 7 ) = 2450
x
7 (1+49) = 2450
x
7 = 2450/50 = 49
x 2
7 = 7 ⇒ x=2
7x+7x+2=2450
7x+7x=2450-2
2x
7 =2448
7x=2448:2
7x=1224
x=1224:7
x=175
7x+7x=2450-2
2x
7 =2448
7x=2448:2
7x=1224
x=1224:7
x=175