exam Maths Puzzle Numerical Ability

13x-4(2x+5)=15

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exam Other Question

please help solve the following.

6m+11=25-m

x^2+5x+6=0

3x^2+5x+1=0

please could you show working out. solve using augmented matrices
2x+y+z=0
3x-2y-3z=-21
4x+5y+3z=-2