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2014-05-19T15:14:58+03:00
5x-15-2x+14=7-14x-42
3x+14x=1+7-42
17x=-34
x=-2

b) 
40x-5-28x-7=9-56+32x
12x-32x=12+9-56
-20x=-35
x=35/20
x=7/4

2 5 2