exam Maths Puzzle Numerical Ability

CAN YOU HELP ME PERFORM THE INDICATED OPERATIONS. Thank you
2x + 2y * 15
_______ ________
7 6x + 6y


a^3b^4 * a^5b^7
________ ________
-2ab^2 a

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exam Other Question

Solve by graphing.
2x+y=1
x-y=2
12-3(x=1)=+17

To solve I first multiply 3 timesx then move x from right to left then add 12 and 17, I am geeting confused. Please help me solve.
Thank you