a, x - 32 + 11 = 21 - 33 + 7
\(\Rightarrow x-32+11-21+33-7=0\)
\(\Rightarrow x-21-21+33-7=0\)
\(\Rightarrow x-42+33-7=0\)
\(\Rightarrow x-9-7=0\)
\(\Rightarrow x-15=0\)
\(\Rightarrow\)\(x=15\)
Vậy: \(x=15\)
Chúc bạn học tốt :)
b, -2.(x+6) + 6. ( x-10)= 8
\(\Rightarrow-2x-12+6x-60-8=0\)
\(\Rightarrow4x-80=0\)
\(\Rightarrow4x=80\)
\(\Rightarrow x=\frac{80}{4}=20\)
Chúc bạn học tốt !!!
c, 7 . x .( 2 + x ) - 7 . x .( x+3) = 14
\(\Rightarrow7x\left(2+x\right)-7x\left(x+3\right)=14\)
\(\Rightarrow7x.\left(2+x-x-3\right)=14\)
\(\Rightarrow7x.-1=14\)
\(\Rightarrow-7x=14\)
\(\Rightarrow x=-2\)
Vậy: \(x=-2\)
d, -4 . ( 2x+9) - (-8+3) -( x + 13 ) = 0
\(\Rightarrow-8x-36+8-3-x-13=0\)
\(\Rightarrow-9x-44=0\)
\(\Rightarrow-9x=44\)
\(\Rightarrow x=-\frac{44}{9}\)
Vậy: \(x=-\frac{44}{9}\)
e, / 2x - 1 / = 15
\(\Rightarrow\left[\begin{matrix}2x-1=15\\2x-1=-15\end{matrix}\right.\)\(\Leftrightarrow\left[\begin{matrix}2x=16\\2x=-14\end{matrix}\right.\)\(\Leftrightarrow\left[\begin{matrix}x=8\\x--7\end{matrix}\right.\)
Vây: \(x=-7;8\)
