exam Maths Puzzle Numerical Ability

how will i solve 6m-3=21

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Please help me to solve.

State which method should be applied as the first step for factoring the polynomial.
6x3 + 9x

should I find GCF first, group the terms or use the ac (trial and error) method? thanks for your time. Please help us with this problem: We are stumped -40-(2x+5)=-61 Thank you!