s: \(\dfrac{y}{-5}=\dfrac{36}{45}\)
=>\(\dfrac{y}{-5}=\dfrac{4}{5}\)
=>\(y=-5\cdot\dfrac{4}{5}=-4\)
t: \(\dfrac{42}{48}=-\dfrac{7}{z}\)
=>\(-\dfrac{7}{z}=\dfrac{7}{8}\)
=>\(z=-7\cdot\dfrac{8}{7}=-8\)
u: \(\dfrac{x-3}{x}=\dfrac{-2}{-1}\)
=>\(\dfrac{x-3}{x}=\dfrac{2}{1}\)
=>2x=x-3
=>2x-x=-3
=>x=-3
v: \(\dfrac{x+1}{6}=-\dfrac{1}{2}\)
=>\(x+1=-\dfrac{1}{2}\cdot6=-3\)
=>x=-3-1=-4
w: \(\dfrac{x-3}{49}=\dfrac{-2}{7}\)
=>\(x-3=-\dfrac{2}{7}\cdot49=-14\)
=>x=-14+3=-11
x: \(\dfrac{x}{4}=\dfrac{x+1}{8}\)
=>\(8x=4\left(x+1\right)\)
=>2x=x+1
=>2x-x=1
=>x=1
y: \(\dfrac{x+2}{4}=\dfrac{3}{6}\)
=>\(\dfrac{x+2}{4}=\dfrac{1}{2}\)
=>\(x+2=4\cdot\dfrac{1}{2}=2\)
=>x=2-2=0
z: \(\dfrac{2x}{49}=-\dfrac{2}{7}\)
=>\(\dfrac{x}{49}=-\dfrac{1}{7}\)
=>\(x=-\dfrac{1}{7}\cdot49=-7\)
