exam Maths Puzzle Numerical Ability

How do I find the value of x for this equation below

x+2x+5=x+19
3x-x=19-5
2x=14
x=7

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exam Other Question

Widgets R Us received proceeds of $3,082.67 from a simple discount note at 11% interest for 4 months. What was the maturity value of the note?

a. $3,300
b. $3,200 Solve the system by addition or substitution.
3x - 4y = 8
6x - 2y = 10