exam Maths Puzzle Numerical Ability

0.05x - 0.3 = 1.8

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exam Other Question

what is the solution of the system?
4x+5y=2
8x+10y=4 please help me solve

factor the trinomial

-6m^2-13m+15

i keep getting
(m+3)(-6m+5) the answer says -(6m-5)(m+3)