exam Maths Puzzle Numerical Ability

solve for x:

(6-x)/3 + x/-5 = -7

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exam Other Question

Can someone please help me simplify this expression?
Use trigonometric identities to simplify the expression
(csc theta)(1-cos ^2 theta)(cot theta) 16. 5x - 2y = -5
Y - 5x = 3