book Maths Puzzle Numerical Ability

I am trying to help my daughter & I am so confused by "simplify the variable expression, here is the problem... (5)(-x) what is the answer & how do we do this? please help

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Premuim coffee sells for $6.00 per pound, and regular coffee sells for $4.00 per pound.How many pounds of each type of coffee should be blended to obtain 100 pounds of a blend that 2(w-3)+5=3(w-1)