exam Maths Puzzle Numerical Ability

Solve the system of equations.
1.5x � 7y = 2
0.625x + 3y = �2.125

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PLEASE,HELP ME TO SOLVE THESE PROBLEMS!
1/2=2/5c-3
5/7x+1/7=3
-1/5t-2=4
THANKS! Im having a major problem with this one: Find the measure of anangle whose supplement is 10 degrees more than twice its comlement. I have tried hard but it seems i having a problem with setting up the equation. Thank you.