Odpowiedzi

2010-03-30T20:15:05+02:00
3-(4-x)+5(1+2x)-2(x+5)=-7
3-4+x+5+10x-2x-10=-7
x+10x-2x=-7-3+4-5+10
9x=-1
x=-¹/₉
2010-03-30T20:16:22+02:00
3-(4-x)+5(1+2x)-2(x+5)=-7
3-4+x+5+10x-2x-10=-7
9x=-1 /9
x=-¹/₉
2010-03-30T20:16:27+02:00
3 - (4-x) + 5(1+2x) - 2(x+5) = -7
3 - (-4) + x + 5 + 10x -2x - 10 = -7
3 + 4 + x + 5 + 10x - 2x - 10 = -7
x + 10x - 2x = -3 - 4 - 5 + 10 - 7
9x = -9 / :9
x = -1