Question

2x+3r+7=0 whas he answer for his

Answer 1

By this equation , we cannot find any specific numeric values of x and r.
There must be any other pair of equation with this one....to find the answer..
else where ,
2x+3r+7=0 ⇒2x=-7-3r  ⇒ x=$\frac{-7-3r}{2}$.
or,  2x+3r+7=0 ⇒ 3r=-7-2x  ⇒ r=$\frac{-7-2x}{3}$
Ans:
x=$\frac{-7-3r}{2}$. 
r=$\frac{-7-2x}{3}$.
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Answer 2

X = 1
r = -3,
so 2(1) +3(-3) +7 = 0.