Solve 12=R*1.25/R+1

$$12 = \frac{ R \times 1.25 }{ R+1 }$$

Solve for R

$$R = -\frac{48}{43} = -1\frac{5}{43} \approx -1.11627907$$

Steps for Solving Linear Equation

Variable R cannot be equal to -1 since division by zero is not defined. Multiply both sides of the equation by R+1.

$$12\left(R+1\right)=R\times 1.25$$

Use the distributive property to multiply 12 by R+1.

$$12R+12=R\times 1.25$$

Subtract R\times 1.25 from both sides.

$$12R+12-R\times 1.25=0$$

Combine 12R and -R\times 1.25 to get 10.75R.

$$10.75R+12=0$$

Subtract 12 from both sides. Anything subtracted from zero gives its negation.

$$10.75R=-12$$

Divide both sides by 10.75.

$$R=\frac{-12}{10.75}$$

Expand \frac{-12}{10.75} by multiplying both numerator and the denominator by 100.

$$R=\frac{-1200}{1075}$$

Reduce the fraction \frac{-1200}{1075} to lowest terms by extracting and canceling out 25.

$$R=-\frac{48}{43}$$