I understood none of today's lesson and I need an explanation on a couple problems, the problems where you have to take an equation with multiple variables and make it so one side has a single isolated variable. Please explain these:
2m - nx = x + 4 solve for x
x/a - 1 = y/b solve for x
V=1/3 (pi) r^2 (h) solve for H
A= (f+g/2) h solve for g
I only need explanations.

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2m - nx = x + 4

2m = x + 4 + nx

2m - 4 = x + nx

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