book Maths Puzzle Numerical Ability

Can you check to see if this is right, thanx

solve for x
3/x-5=8
3=8(x-5)
3=8x-40
+40 +40
43=8x
x=43/8

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book Other Question

Solve and Graph:
y = -3x*2 + 6x
write expression as an equivalent expression?