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4/3x+3=163
4/3x=163-3
4/3x=160
x=160*3/4
x=120
x+3x+9=489
4x=480/:4
x=120
chyba tak;)
x/3 + x = 160 |x3
x +3x = 480
4x = 480 |:4
x = 120