exam Maths Puzzle Numerical Ability

PLease help to solve

3/5x - 1/4y = 7

0.08x + 0.05y = 1.6

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exam Other Question

which of the following is not an expression.

a.) x+2y
b.) a+b+c
c.) ab=6
d.) 4(y+1)
e.) none of the above

thanks for your help from McDugal Littell Algebra I
Factor the expression:
2x�+5x+3