Решите уравнение:
а) x + (x + 4) = 10;
б) (x + 1) + (x + 3) = 5;
в) x + (x + 2) + (x + 4) = 7.
x + (x + 4) = 10
x + x + 4 = 10
2x = 10 − 4
2x = 6
x = 6 : 2
x = 3
(x + 1) + (x + 3) = 5
x + 1 + x + 3 = 5
2x + 4 = 5
2x = 5 − 4
2x = 1
x = 1 : 2
x = 0,5
x + (x + 2) + (x + 4) = 7
x + x + 2 + x + 4 = 7
3x + 6 = 7
3x = 7 − 6
3x = 1