781. 1) 3,4x - 4 = 4,8 – x;
2.
782. 1) x = 2/3x + 1;
3
783. 1) 7x - (3 + 2x) = x + 9;
2.
782. 1) x = 2/3x + 1;
3
783. 1) 7x - (3 + 2x) = x + 9;
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781. 1) 3,4х - 4 = 4,8 - х
3,4х + х = 4,8 + 4
4,4х = 8,8
x = 8,8 : 4,4
х = 2
Ответ: х = 2
782. 1) x = 2/3x + 1
x = 2x/3 + 3/3
x = 2x + 3/3
3x = 3 • 2x + 3/3
3x = 2x + 3
x = 3
Ответ: x =3
783. 1) 7х - (3 + 2х) = х + 9
7х - 3 - 2х = х + 9
7х - 2х - х = 3+9
4х = 12
х = 12:4
х = 3
Ответ: x = 3