Question

please give answers for all of them.

Answer 1

1 5r - 7 = 2r + 8

5r-2r = 8+7

3r = 15

r = 15/3

r = 5

2 t - (3t-1) = t -4

t - 3t +1 = t -4

-2t +1 = t -4

-2t -t = -4-1

-3t = -5

t = 5/3

3 2a+1 = 3

3a-1 2

2(2a+1) = 3 (3a-1)

4a +2 = 9a -3

4a-9a = -3-2

-5a = -5

a = 1

4 x+5 - x-5 = 25

2 3 6

3(x+5) - 2(x-5) = 25

6 6

3x +15 -2x+10 = 25

6 6

x+25 = 25

6 6

x + 25 = 25

x =0