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x + x +1 = 51
2x = 50
x=25
x+1= 26
B.-
x+x+1+x+2 =63
3x = 60
x = 20
x+1=21
x+2 =22
C.-
"9 + N = V"
V +N = 47
9 + N + N = 47
2N = 38
N = 19
V = 28