${20}$ - ${5}$ : ( x - ${1}$) = ${15}$
${15}$ : ( x - ${1}$) =${15}$
x - ${1}$ = ${1}$
x = ${1}$+${1}$
x =${2}$
${17}$x + x - ${4x}$ = ${70}$
x = ${18x}$ - ${4x}$
x = ${14}$
x = ${70}$ : ${14}$
x =${5}$
${42}$ - ( x+ ${1}$ ) * ${3}$ = ${9}$
x = x + ${1}$ *${3}$
x =${42}$ +${9}$
x +${1}$ = ${51}$
x +${1}$ = $\frac{51}{3}$
x +${1}$ = ${17}$
x = ${17}$ - ${1}$
x = ${16}$
${70}$ - ${35}$ * ( x - ${3}$ ) = ${35}$
${35}$ * ${3}$ = ${70}$
x = ${70}$ - ${35}$
x = ${35}$
x - ${3}$ = $\frac{35}{35}$ = ${1}$
x = ${3}$ + ${1}$
x =${4}$
${CHO}$ ${CÂU}$ ${TRẢ}$ ${LỜI}$ ${HAY}$ ${NHẤT}$ ${NHA}$ ${VOTE}$ ${VÀ}$ ${CẢM}$ ${ƠN}$ ${NỮA}$ ${NHA}$
${CHÚC}$ ${HỌC}$ ${TỐT}$ ${!!!!!!!!!!!!}$
