exam Maths Puzzle Numerical Ability

Tell wheather the given value of the varible is a solution of the equation.
-9x+7=25+2(5-x);x=-4.

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exam Other Question

Use a graphic calculator to solve the equation. Round to two decimal places:
8 on power "x" =2.1

Thanks Find one set of polar coordinates for the point given in rectangular coordinates. The equation is {{{(2,-3)}}}.