exam Maths Puzzle Numerical Ability

Can you please show a breakdown to this? So I understand how to do these types of algebra problems? Thanks 16-5(3t-4)=8(-2t+11)

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0.0625a + 0b + 0c + 0d =0
-0.125a + 0.5b - 0.25c + 0d=5.625
0a - 0.25b + 0.55c - 0.1d =0
-0.25a + 0b -0.1c + 0.4d =-7.5 An air sample 4.0 ppm (parts per million) of two pollutants. The concentration of one is four times the other. What are the concentrations?