exam Maths Puzzle Numerical Ability

please help me to divdie :

4x^3 + 3 by a - 1 and check

thank u

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exam Other Question

How can I solve this problem using substitution

x-3y=-1
5x-7y=19
x-3 + y+5 =11/6
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2 3 </PRE>

I am having a hard time getting this formatted the right way. The 3 should be under y+5