Question 157985
x+(x+1)=469
2x+1=469
2x=469-1
2x=468
x=468/2
x=234 for the left hand page number.
234=1=235 for the right hand page.
Proof
234+235=469  
469=469
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2x+3=5x-3/4
2x-5x=-3/4-3
-3x=(-3-12)/4
-3x=-15/4
x=(-15/4)/-3
x=-15/4*1/-3
x=5/4 answer.
Proof:
2*5/4+3=5*5/4-3/4
10/4+3=25/4-3/4
(10+12)/4=22/4
22/4=22/4
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x+x+1+x+2=99
3x+3=99
3x=99-3
3x=96
x=96/3
x=32 for the l;owest code.
32+1=33 for the next one.
32+2=34 for the last one.
Proof;
32+33+34=99
99=99