exam Maths Puzzle Numerical Ability

7c+6+5c=234

Help!i need to solve for c

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exam Other Question

(3x^2+2x-5/5x+1)+(2x^2-x+6/5x+1)

I have no idea how to do this problem
Key ^=exponents /=all over or fraction
4x3-19x+15
determine two other linear factor of f(x)