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Ответ:

1) x + 4 = -2x + 3

3x = -1

x = -1/3

2) -0,4x + 3,8 = 2,6 - 0,5x

0,1x = -1,2

x = -12

3) 1/7x = -3/14

x = -3/14 / 1/7

x = -3/14 * 7/1

x = -3/2

x = -1,5

4) -2 1/4x = 9/16

-9/4x = 9/16

x = 9/16 / -9/4

x = 9/16 * -4/9

x = -1/4

x = -0,25