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2·x+3
x=-3 ⇒ 2·(-3)+3 = -6+3 =-3
x=+7⇒ 2·(+7)+3= 14+3= 17
x= -1⇒ 2·(-1) +3= -2+3 =1
x= +2 ⇒ 2·(2)+3= 4+3 =7