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1) -3x = -21; x = -21 / -3; x = 7

2) -2x = ; x = / ; x = * = -

3) -1,2x = -4,2; x = -4,2 /  -1,2; x = 3,5

4) x = -; x = * =

5) 3(4x - 5) - 10(2x-1) = 33

12x - 15 - 20x - 10 = 33

-8x -25 = 33

-8x = 33 + 25; -8x = 58; x = 58 / -8; x = або x = -4,75

6) + = 5

= 5

= 5

= 5 / *6

7x+23 = 30; 7x = 30 - 23; 7x = 7; x = 7/7; x = 1

1) x - y = 2

y = 1; x - 1 = 2; x = 3

y = 0; x - 0 = 2; x = 2

y = 2; x - 2 = 2; x =4

2) x + 3y = 0

y = 1; x + 3 = 0; x = -3

y = 2; x + 6 = 0; x = -6

y = 3; x + 9 = 0; x = -9

1) x - 2y = -8; x = -8 + 2y

2) 7x - y = 9; 7x = 9 - y; x =

3) 5x - 7y = 12

5x = 12 + 7y

x =