exam Maths Puzzle Numerical Ability

33-9(5-m)=4(m+7) can this answer be a negative decimal?
trying to work out but getting stuck

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exam Other Question

4x - 5 (3x + 10) = 126
Please help with solving..need breakdown to solve other equations like this one. Thank you!
x-3y=7
2x-5y=13
solve by substitution