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2014-10-05T20:52:24+03:00
A) 2x-1=x+3
    2x-x=3+1
    x=4

b) 2(x+1) + 3x = 4x - 5(x+2)
    2x+2+3x=4x-5x-10
    2x+3x-4x+5x=-10-2
    6x=-12
    x=-12:6
    x=-2
    

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