book Maths Puzzle Numerical Ability

5x=x+32

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book Other Question

Please help me...which of the following is a factor of
3x^2+2x-16

A)x-2
B)x+8
C)3x-8
D)3x-2

Please show me how you worked this out...thanks Solve by the Elimination Method
0.06x+0.18y=-0.9
0.5x-0.7y=5.7
What is the solution of the system?