Solve 980=x+(x*0.4)+((x*0.4)*0.4)

$$980=x+(x \times 0.4)+((x \times 0.4) \times 0.4)$$

Solve for x

$$x = \frac{24500}{39} = 628\frac{8}{39} \approx 628.205128205$$

Steps for Solving Linear Equation

Combine x and x\times 0.4 to get 1.4x.

$$980=1.4x+x\times 0.4\times 0.4$$

Multiply 0.4 and 0.4 to get 0.16.

$$980=1.4x+x\times 0.16$$

Combine 1.4x and x\times 0.16 to get 1.56x.

$$980=1.56x$$

Swap sides so that all variable terms are on the left hand side.

$$1.56x=980$$

Divide both sides by 1.56.

$$x=\frac{980}{1.56}$$

Expand \frac{980}{1.56} by multiplying both numerator and the denominator by 100.

$$x=\frac{98000}{156}$$

Reduce the fraction \frac{98000}{156} to lowest terms by extracting and canceling out 4.

$$x=\frac{24500}{39}$$