When we add rational numbers we simply add or subtract the fraction or part of a whole so in this particular equation we would subtract 1 from 4 because adding a negative means the same thing. We then subtract 2/3 from 3 and get 2 1/3 Comment below if more details are required
X times 3. Or some variant of that. But that’s the most basic answer
-1
You put -1,5 on top of 6,-2 then u subtract so basically-1-6=-7 and 5- -2=7 so -7 over 7 you divide both by 7 to make it in simple form so it’s -1
Answer
a) 2 x + 3 = 13 - 5 x
7 x = 13 -3
7 x = 10

b) 6 + 4 x = 10 x + 26
6 x = 20


c) 6 x + 9 = 13/5 - x


d) 0.6 + 0.4 x = x + 2.6
0.6 x = -2


e) 3(2x + 3) = 13/5 -x
6 x + 9 = 13/5 - x


f) 4 x = -10 x + 20
14 x = 20

g) 15(2x + 3) = 13 - 5x
30 x + 45 = 13 - 5 x
35 x = -32

h)15(2x + 3) + 97 = 110 - 5x
30 x + 45 + 97 = 110 - 5x
35 x = -32

so , the solution of part c, e, g, h is same which is 
the solution of part a, f is same which is