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2014-11-09T11:57:36+02:00
[(x + 5) : 300 +40] :10 - 70 = 30
[(x + 5) : 300 +40] :10 = 100
(x + 5) : 300 +40 = 1000
(x + 5) : 300 = 960
x + 5 = 288000
x = 287995

[4(x + 7)2 + 2(x + 7)] : 6 = 25
[8(x + 7) + 2(x + 7)] : 6 = 25
[10(x + 7)] : 6 = 25
(x + 7) · 10 = 150
x + 7 = 15
x = 8
2014-11-09T12:06:38+02:00
[(x+5):300+40]:10-70=30
[(x+5):300+40]:10=100
(x+5):300+40=1.000
(x+5):300=960
x+5=288.000
x=287.995

[4·(x+7)·2+2·(x+7)]:6=25
4·(x+7)·2+2·(x+7)=150
(4x+28)·2+2x+14=150
10x+56+14=150
10x=150-56-14
10x=80
x=8