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x/3 + x = 160 II*3
x+3x=480
4x=480
x=120
x/3+x=163-3
x/3+x=160 <-- *3
x+3x=480
4x=480<---- :4
x=120
Ta liczba to 120 ;))
3 - dzielnik
x/3 - iloraz
x/3 + x + 3 = 163 ------> obie strony * 3
x + 3x + 9 = 489
4x = 480 /:4
x = 120