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2x + 40 = x-20 + 2/3x + 40/3
2x - x - 2/3x = -20 + 13 i 1/3 - 40
1/3 x = -46 i 2/3
1/3x = -140/3 /*3
x = -140
2(x+20)=x-20+⅔x+13⅓
2x+40-x-⅔x=-20+13⅓
⅓x=-6⅔-40----->/:⅓
x=-140
Polecam się na przyszłość :P
2x+40=x-20+2/3x+40/3
6x+120=3x-60+2x+40
x=-140