Question

4X + X/3 = 39

X + X/2 =12

X/4 - 1 = 2 + X/10

Answer 1

$\displaystyle \mathsf{ 4x + \frac{x}{3} = 39} \\ \displaystyle \mathsf{ \frac{12x + x}{3} = \frac{117}{3}} \\ \displaystyle \mathsf{13x = 117 } \\ \displaystyle \mathsf{x = \frac{117}{13} = 9}$

$\displaystyle \mathsf{ x+ \frac{x}{2} = 12 } \\ \displaystyle \mathsf{\frac{2x + x}{2} = \frac{24}{2}} \\ \displaystyle \mathsf{ 3x= 24 } \\ \displaystyle \mathsf{ x = \frac{24}{3} = 8 }$

$\displaystyle \mathsf{\frac{x}{4} - 1 = 2 + \frac{x}{10}} \\ \displaystyle \mathsf{ \frac{x}{4} - \frac{x}{10} = 2 + 1 } \\ \displaystyle \mathsf{\frac{10x - 4x}{40} = \frac{120}{40}} \\ \displaystyle \mathsf{6x = 120 } \\ \displaystyle \mathsf{ x = \frac{120}{6} = 20 }$