exam Maths Puzzle Numerical Ability

twice a number increased by 12 is equal to 31 less than three times the number. find the number

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exam Other Question

log(base 10)y + log(base 10)(y+3)=1 Could someone help me I am confused .
Simplify and evaluate (x^3 y^-4 z^0 / 5x^6 y^8)^3