\(15-\left(x-4\right)=8\)
\(x-4=15-8\)
\(x-4=7\)
\(x=7+4\)
\(x=11\)
x=11
x=9
x=-3
x=-3
x=7 hoặc x=-17
x=7 hoặc x=-6
\(14-\left(25-8\right)=x-\left(19-7\right)\)
\(14-17=x-12\)
\(x-12=-3\)
\(x=-3+12\)
\(x=9\)
\(5x-\left(-17\right)=2\)
\(5x+17=2\)
\(5x=2-17\)
\(5x=-15\)
\(x=-15\div5\)
\(x=-3\)
\(\left(2x-5\right)+17=6\)
\(2x-5=6-17\)
\(2x-5=-11\)
\(2x=-11+5\)
\(2x=-6\)
\(x=-6\div2\)
\(x=-3\)
a)
\(15-\left(x-4\right)=8\)
\(\Leftrightarrow15-x+4=8\)
\(\Rightarrow15-x=8-4\)
\(\Rightarrow15-x=4\)
\(\Rightarrow x=15-4\)
\(\Rightarrow x=11\)
b)
\(14-\left(25-8\right)=x-\left(19-7\right)\)
\(\Rightarrow14-17=x-12\)
\(\Leftrightarrow14-17+12=x\)
\(\Rightarrow\left(-3\right)+12=x\)
\(\Rightarrow9=x\)
\(5x-\left(-17\right)=2\)
\(5x=2+\left(-17\right)\)
\(5x=\left(-15\right)\)
\(x=\left(-15\right):5\)
\(x=\left(-3\right)\)
c)
\(\left(2x-5\right)+17=6\)
\(\Rightarrow\left(2x-5\right)=6-17\)
\(\Rightarrow\left(2x-5\right)=\left(-11\right)\)
\(\Rightarrow2x=\left(-11\right)+5\)
\(\Rightarrow2x=\left(-6\right)\)
\(\Rightarrow x=\left(-3\right)\)
e)
