2+3x - (5-2x) = 8 найдите X, 7x-8 - (3x+2) = 0 найдите X

2+3 х - (5-2 х) = 8

2+3 х-5+2 х=8

5 х=8-2+5

5 х=11

х=11:5

х=2 1/5

Проверка:

2+3*2 1/5 - (5-2*2 1/5) = 8

2+33/5-5+22/5=8

2-5+55/5=8

2-5+11=8

8=8

7 х-8 - (3 х+2) = 0

7 х-8-3 х-2=0

4 х=8+2

4 х=10

х=10/4

х=2 1/2

Проверка:

7*2 1/2-8 - (3*2 1/2+2) = 0

35/2-8-15/2-2=0

20/2-10=0

10-10=0

0=0

2+3x - (5-2x) = 8 7x-8 - (3x+2) = 0

2 + (-15 х) + 6 х=8 7 х-8 * (-3 х-2) = 0

-11 х=8-2 7 х+24 х+16=0

-9 х=6 32 х=-16

х=-1.5 х = 32: (-16)

х=-2!