Marvin earned $2 less than twice the amount he earned last week. He earned $23 this week. How much did he earn last
week?

Math each whole number with a rational,exponential expression

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Which of the following equations is equivalent to x/3-6/x=1