Question

find the value of x    
a. 7x=21
b.9x=-81
c. 88=-11x
d 0.5x=49

Answer 1

a. x=3 because you divide both by 7
b. x=9 because again you divide both by 9
c. x=8 because you divide both by 11 to isolate the variable
d. x=98 because you divide 49 by .5

Answer 2

a. 7x=21
x=3
b. 9x=-81
x=-9
c. 88=-11x
x=-8
x/2=49
x=98