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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 :)
-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