20x+7=5x+10
15x=3
3/15=.2
x=.2
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3x - 7 = 5x + 13-2x = 20x = -10
3x - 7 = 5x + 133x - 5x = 13 + 7-2x = 20x = -10x=-3
5x-8 = x+125x-x = 8+124x = 20x=5
Factorises as (5x-2)(5x-2) so x = 0.4 25x2= 4, -20x = -8 4 - 8 + 4 = 0
5x2 + 20x = 5x (x + 4)