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a) x = -4
2(-4)+1=-8+1=-7
b) x = 0
2*0+1=1
c) x = 2
2*2+1=4+1=5
d) x = -12
2(-12)+1=-24+1=-23
b) 2×0 +1= 1
c) 2×2 + 1 = 5
d) 2× (-12) + 1 = -24 + 1 = -23