exam Maths Puzzle Numerical Ability

pls help me understand this problem: Find a number that is 68 greater than three times its opposite.

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exam Other Question

Solve this equation

I=Prt + P;P

What is the answer, including the steps? Solve following systems by addition

2x+3y=1
5x+3y=16

2x+3y=1
-5x-3y=-16
-3x=-15
x=-5

Double checking to see if these are right?