Giải thích các bước giải:
f.$\dfrac{x-1}{2}-\dfrac{x+1}{15}-\dfrac{2x-13}{6}=0$
$\to \dfrac{x-1}{2}\cdot \:30-\dfrac{x+1}{15}\cdot \:30-\dfrac{2x-13}{6}\cdot \:30=0\cdot \:30$
$\to 15\left(x-1\right)-2\left(x+1\right)-5\left(2x-13\right)=0$
$\to 3x+48=0$
$\to 3x=-48$
$\to x=-16$
g.$\dfrac{3(3-x)}{8}+\dfrac{2(5-x)}{3}=\dfrac{1-x}{2}-2$
$\to \dfrac{3\left(3-x\right)}{8}\cdot \:24+\dfrac{2\left(5-x\right)}{3}\cdot \:24=\dfrac{1-x}{2}\cdot \:24-2\cdot \:24$
$\to 9\left(-x+3\right)+16\left(-x+5\right)=12\left(-x+1\right)-48$
$\to -25x+107=-12x-36$
$\to -13x=-143$
$\to x=11$
h.$\dfrac{3(5x-2)}{4}-2=\dfrac{7x}{3}-5(x-7)$
$\to \dfrac{3\left(5x-2\right)}{4}\cdot \:12-2\cdot \:12=\dfrac{7x}{3}\cdot \:12-5\left(x-7\right)\cdot \:12$
$\to 9\left(5x-2\right)-24=28x-60\left(x-7\right)$
$\to 45x-42=-32x+420$
$\to 77x=462$
$\to x=6$
