book Maths Puzzle Numerical Ability

2(w-3)+5=3(w-1)

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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 What is the answer to 3x/5-4/5(x+1)=2-3/10(3x-4)