You need to get rid of anything that is NOT "x", on the left side of the equation (i.e., of the equal sign). In this case, you achieve this by dividing both sides of the equation by 5.
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-5x+50 = 25 -5x = 25-50 -5x = -25 x = 5
x = 25 / 3squared + 5
-5x2 = -75 x2 = 25 x = ±sqrt( 25 ) x = ±___
5x - 7=18 you add the seven to 18 and get 25 then you divide 25 by 5 to get x by itself and you will get 5 x=5
5x+25=10 5x+25-25=10-25 5x=-15 5x/5=-15/5 x=-3