exam Maths Puzzle Numerical Ability

I WANT TO LEARN PRE-ALGEBRA: HOW DO I SOLVE X=8

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I need help on the problem: 4i-2x-3=4ix+6i-5x. Solve for x and give the solution in standard "a+bi" form. If sin (theta)=-9/13 and cos (theta)>0, then find the exact value (no decimals) of cos (theta).