Question

Solve for X. -10x=-210

Answer 1

X=21 ! ...........................

Answer 2

X=21
-10x= -210         
-------  -------
-10      -10
X= 21
The line under the -10x and -210 is a division line  you would                       divide  -10x by -10 which would cancel out the -10 and divide -210 by -10 which when you divide a negative by a negative you would get a positive which leaves you with 21.