exam Maths Puzzle Numerical Ability

Please help..
Solve these using the multiplication principle.
- x/4 = 11

- 3/5x=12/35

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exam Other Question

(8x (x to the 2 power) + 8x-2)-(8x (x to 2nd power) +5) = 6x+2. Can you explain..pretty new with computer and math. Going back to school. Im stumped..please help (Nine more than the product 4 and the number is 73). I am helping my niece and I am stumped, Help.....