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

an amusement park purchased equipment form a manufacturer for $42,000 minus trade discounts of 30/20/15.

Show me how to caculate the trade discount on the purchase. Please. The endpoints of the diameter of a circle have coordinates R(-8,2) and S(10,-4). Find the coordinates of the center of the circle.