Ответ:
Пошаговое объяснение:
1) 7x - (3 + 2x) = x + 9;
7x - 3 - 2x = x + 9
5x - 3 = x + 9
5x - x = 9 + 3
4x = 12
x = 12 : 4
x = 3
2) 13 - (2x - 5) = x - 3;
13 - 2x + 5 = x - 3
18 - 2x = x - 3
x + 2x = 18 + 3
3x = 21
x = 21 : 3
x = 7
3) 3x – (10 - 9x) = 223;
3x - 10 + 9x = 223
12x - 10 = 223
12x = 223 + 10
12x = 233
x = 233 : 12
x = 19 5/12
4) 26 - (17 – 2x) = 5x.
26 - 17 + 2x = 5x
9 + 2x = 5x
5x - 2x = 9
3x = 9
x = 9 : 3
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Answers & Comments
Ответ:
Пошаговое объяснение:
1) 7x - (3 + 2x) = x + 9;
7x - 3 - 2x = x + 9
5x - 3 = x + 9
5x - x = 9 + 3
4x = 12
x = 12 : 4
x = 3
2) 13 - (2x - 5) = x - 3;
13 - 2x + 5 = x - 3
18 - 2x = x - 3
x + 2x = 18 + 3
3x = 21
x = 21 : 3
x = 7
3) 3x – (10 - 9x) = 223;
3x - 10 + 9x = 223
12x - 10 = 223
12x = 223 + 10
12x = 233
x = 233 : 12
x = 19 5/12
4) 26 - (17 – 2x) = 5x.
26 - 17 + 2x = 5x
9 + 2x = 5x
5x - 2x = 9
3x = 9
x = 9 : 3
x = 3