-2x

3x+1

10

this is what i understood from what you typed...
Answer:
7
Step-by-step explanation:
What times 3 = 21 . 7 x 3 = 21 therefore 7 is the x
Answer:
15t+9r=2
Step-by-step explanation:
the terms which are the variables are not the same on any part of the equation
Let's say that number is "x", therefore "x" is the 100%, and we know that 15 is 1 and 1/2% of that,