exam Maths Puzzle Numerical Ability

this is from a work sheet. I need to know how to work this problem.

3x/4 + 1 = 10

Thanks

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exam Other Question

Find four solutions for the equation 3x + 5y = 15.
No book. Thank you very much for your time!! can some one help me find the diameter.

Diameter of a circle
If the diameter of a circle is 1.3 * 10^-12 meters, then what is the radius.