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2,4 - 2 = 0, 4
0/100*x+6/100*40=5/100(x+40)/*100
100*0/100*x+100*6/100*40=100*5/100(x+40)
0x+6*40=5(x+40)
0x+240=5x+200
0x-5x=200-240
-5=-40/:(-5)
x=-40/-5
x=8
/-kreska ułamkowa
*-znak mnożenia.
Mam nadzieje, że pomogłam :*