exam Maths Puzzle Numerical Ability

how do u solve 4x+7(2x-1)=12

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exam Other Question

Add or Subtract the fractions. Express the answer in simplest form:

A: [(3b-8)/(b-6)]+[(b-16)/(b-6)]

B: [(5a-12)/(a^2-8a+15)]-[(3a-2)/(a^2-8a+15)] compute the arthmetic mean for the following data, to 2 decimal places of significance: 8,2.2,25,7,-9,10,2, and 5.9