Answer:
x=400
Step-by-step explanation:
You cannot subtract the 30x from 985 because 985 is not a like term - meaning there is no 'x' attached to 985. Very important - only add/subtract like terms.
So:
30x - 215 = 985
move 215 to the other side because 215 and 985 are similar (they are just regular numbers - no extra variables). To move 215 to the other side you need to perform the same operation to both sides of the equal sign.. that way it cancels out on one side and moves to the other, like so:
(30x - 215)+215 = 985+215
=> 30x = 1200
Now we need to find x, not 30 x, so since 30 is being multiplied by x, to get it the other side we need to divide it out..
(30x)/30 = (1200)/30
x = 400
