Within the metric system all units are based on the number
a. 100.
b. 1000.
c. 1.
d. 10.

We want to know what is the basis of al units in tne metric system. The metric system is a set of decimal-based prefixes that have the effect of multiplication or division by the integer power of ten. Which means that when we have some unit like a meter or a kilogram, to get to the smaller unit we need to divide by the integer power of ten or when we want a greter unit we need to multiply the unit by the integrer power of ten. So the corret answer is D.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

the value of x is equal to 0.