Simplify $\frac{8x}{12}+\frac{10x}{12}$8x12+10x12
Simplify $\frac{y}{11}-\frac{9y}{11}$y11−9y11
Simplify $\frac{17y}{20}+\frac{14y}{20}$17y20+14y20
Simplify $\frac{7x}{3}-\frac{5x}{3}$7x3−5x3
Addition, subtraction of algebraic expressions (coefficients should be integers).