exam Maths Puzzle Numerical Ability

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

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exam Other Question

CAN YOU HELP ME PERFORM THE INDICATED OPERATIONS. Thank you
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_______ ________
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________ ________
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