-2. ( x + 3 ) -15 = 3. (4+2x ) +7
<=> -2x-6-15=12+6x+7
<=>-2x-21=6x+19
<=>-2x-6x=19+21
<=>-8x=40
<=>x=40:(-8)
<=>x=-5
Vẫy=-5
-2. ( x + 3 ) -15 = 3. (4+2x ) +7
-2x - 6 -15 =12 + 6x + 7
-2x - 6x = 12 + 7 + 6 + 15
-8x = 40
x= -5
hok tốt!!!
\(\text{-2. ( x + 3 ) -15 = 3. (4+2x ) +7}\)
\(\Leftrightarrow-2x-6-15=12+6x+7\)
\(\Leftrightarrow-2x-6-15-12-6x-7\)\(=0\)
\(\Leftrightarrow-8x-40=0\)
\(\Leftrightarrow-8x=40\)
\(\Leftrightarrow x=-\frac{40}{8}\)
Vậy...
Học tốt
\(-2\left(x+3\right)-15=3.\left(4+2x\right)+7\)
\(-2x-6-15=12+6x+7\)
\(-2x-6x=12+6+7+15\)
\(-8x=40\)
\(x=-5\)
-2. ( x + 3 ) -15 = 3. (4+2x ) +7
<=>-2x-6-15=12+6x+7
<=>-2x-21=19+6x
<=>-2x-21-19-6x=0
<=>-8x-40=0
<=>-8x=40
<=>x=-5
Vậy x=-5
