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100

(2 x 10 + 10) - 15

5

100

-12r + 4 = 100

r = -8

100

3(x + 2)

3x + 6

100

x + 5 + x + 7

2x + 12

100

3(y + 5) = 21

y = 2

200

12 - 3 x (14/7)

6

200

-9 + n/4 = -7

n = 8

200

3(y - 5)

3y - 15

200

5x - 7 - 7x + 4

-2x - 3

200

7(p - 3) = 35

p = 8

300

[(12 - 5) x 6 + 22]/8

8

300

4 - 3y = 31

y = -9

300

2(9x + 2)

18x + 4

300

-4x - y + 5 -2x - 6

-6x - y - 1

300

-48 = 6(v + 2)

v = -10

400

17 + 50/10 x 20

117

400

(9+m)/3 = 2

m = -3

400

7(7y - 2)

49y - 14

400

2y + 5 + 4x -2x + 3y + 4

2x + 5y + 9

400

16 = 2(2x + 4)

x = 2

500

8/4 - 8 x 2

-14

500

(-5 + x)/22 = -1

x = -17

500

2(9x + 2y)

18x + 4y

500

-10y + 7x - 6 + 10y -5x

2x - 0y - 6  or  2x - 6

500

6(2n - 7) = 18

n = 5