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2014-04-30T15:54:08+03:00
A) 3(x+y)-1=-7-1=-8
b) x+y+y+z=-7+1=-6
c) 2x+2y+3y+3z-7=2(x+y)+3(y+z)-7=2*(-7)+3*1-7=-14+3-7=-18
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