exam Maths Puzzle Numerical Ability

i would like you to help me on this problem.
it is dealing with fractions in the substitution method.

solve by the substitution method:
m over 3 +

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exam Other Question

Can you please tell me if i did this right?

Solve for x:

7x - 3 = -5x - 18

add 5x to both sides which is 7x + 5x = 12x
and add 3 to both sides which is -18 +3 = -15
12x=-15
x= - 15/12 = 1 1/4
what is the answer to 25w+w-60w+36