148. Решите уравнение: a) 2x+9=13-x; б) 14-у-19-11y; в) 0,5а + 11 =4-3a; г) 1,2n + 1 = 1-n; 149. Решите уравнение: д) 1,7-0,3m = 2+1,7m; e) 0,8x + 14 = 2-1,6x; 1 ж) 15-р - р - 1; 1 3 3) 13x+4=x+1; 3 1 и) 2-2 = 0; 2 к) х - 4x = 0; л) х = -x; м) бу = 6у.

a) 2x+9=13-x

2x + x = 13 - 9

3x = 4

x = 4/3

б) 14-y=19-11y

-y + 11y = 19 - 14

10y = 5

y = 5/10

y = 1/2

в) 0,5a + 11 = 4 - 3a

0,5a + 3a = 4 - 11

3.5a = -7

a = -7/3.5

a = -2

г) 1,2n + 1 = 1 - n

1,2n + n = 1 - 1

2,2n = 0

n = 0

д) 1,7 - 0,3m = 2 + 1,7m

-0,3m - 1,7m = 2 - 1,7

-2m = 0,3

m = 0,3/(-2)

m = -0,15

e) 0,8x + 14 = 2 - 1,6x

0,8x + 1,6x = 2 - 14

2,4x = -12

x = -12/2,4

x = -5

ж) 15 - p = \frac{1}{3}p - 1

-p - \frac{1}{3}p = -1 - 15

-\frac{4}{3}p = -16

p = -16 \cdot (-\frac{3}{4})

p = 12

з) 1\frac{1}{3}x + 4 = \frac{1}{3}x + 1

\frac{4}{3}x - \frac{1}{3}x = 1 - 4

\frac{3}{3}x = -3

x = -3

и) z - \frac{1}{2}z = 0

\frac{1}{2}z = 0

z = 0

к) x - 4x = 0

-3x = 0

x = 0

л) x = -x

x + x = 0

2x = 0

x = 0

м) 5y = 6y

5y - 6y = 0

-y = 0

y = 0