x+4=2x-4 7x+20=2(x+20) x+3=3(x-3)

x+4=2x-4 /-x +4 x = 8 7x+20=2(x+20) 7x+20 = 2x+40 /-2x -20 5x = 20 /:5 x = 4 x+3=3(x-3) x+3 = 3x-9 /-x -3 2x = -12 /:2 x = -6 proszę bardzo :)

x+4=2x-4 -2x+x=-4-4 -x=-8 /: -1 x=8 7x+20=2(x+20) 7x+20=2x+40 7x-2x=40-20 5x=20/:5 x=4 x+3=3(x-3) x+3=3x-9 -3x+x=-9-3 -2x=-12/: -2 x=6