Question

lm từng bước giúp mk nhé, cảm ơn

Answer 1

a) \(-x+80=-220-5x\)

\(\Rightarrow-x+5x=-220-80\)

\(\Rightarrow4x=-300\)

\(\Rightarrow x=-\dfrac{300}{4}\)

\(\Rightarrow x=-75\)

b) \(98+\left(x-12\right)+68=-80-x\)

\(\Rightarrow166+\left(x-12\right)=-80-x\)

\(\Rightarrow166+x-12=-80-x\)

\(\Rightarrow154+x=-80-x\)

\(\Rightarrow154+80=-x-x\)

\(\Rightarrow-2x=234\)

\(\Rightarrow x=-\dfrac{234}{2}\)

\(\Rightarrow x=-117\)

c) \(122+x-78=-55-4x-1\)

\(\Rightarrow44+x=-56-4x\)

\(\Rightarrow x+4x=-56-44\)

\(\Rightarrow5x=-100\)

\(\Rightarrow x=-\dfrac{100}{5}\)

\(\Rightarrow x=-20\)

d) \(663+9x=-x-37\)

\(\Rightarrow9x+x=-37-663\)

\(\Rightarrow10x=-700\)

\(\Rightarrow x=-\dfrac{700}{10}\)

\(\Rightarrow x=-70\)