exam Maths Puzzle Numerical Ability

J(AF)=130.84 I need to find values for J,A, AND F

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exam Other Question

Please help! How do I solve the following equations?

(a) -x+12=-4+x

(b) 3(x-2)+2=2(x-4)

(c) x/5 - x/3 = 8/15

(d) I = Prt Solve for r I dont know what 2=2 is