book Maths Puzzle Numerical Ability

5(x+5)=25+5x

a) -5 b) 0 c) all real numbers d) no solution

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book Other Question

can you help me out by solving these problems out by steps?
I would really appreciate it very much
set 4

1. write an example of a quadratic trinomial?

2. perform the indica 19= (the answers are........VIV,XXI,XIX,or none of these)