exam Maths Puzzle Numerical Ability

Please can you help me find x

((( 8x³/2x - 3x - 2 = 0 )))

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exam Other Question

Sean is buying a new DVD player and speakers for $315. The store offers him an interest free payment plan that allows him to pay in monthly installmants of $25.

Use n to stand f
I need steps for this thanks

Solve the linear system by any method. 3x-2y=3 6x+2y=3