(x*5-19)+(x*3+24)=125.
x*5-19+x*3+24=125.
x*(5+3)+(24-19)=125.
=>x*8+5=125.
=>x*8=120( bớt cả 2 vế đi 5 đơn vị)
=>x=120:8.\
=>x=15.
Vậy x=15.
\(\left(x\cdot5-19\right)+\left(x\cdot3+24\right)=125\)
\(\Rightarrow5x-19+3x+24=125\)
\(\Rightarrow5x+3x=125+19-24\)
\(\Rightarrow8x=120\)
\(\Rightarrow x=120:8=15\)
Vậy x = 15
( x * 5 - 19 ) + ( x * 3 + 24 ) = 125
x * 5 - 19 + x * 3 + 24 = 125
<=> x * ( 5 + 3 ) + x * ( 24 - 19 ) =125
<=> x * 8 + x * 5 = 125
<=> x * (8 + 5 = 125
<=> x * 8 = 125 : 5
<=> x * 8 = 125 - 5
<=> x * 8 = 120
<=> x = 120 : 8
<=> x = 15
Vậy x = 15
^^ Cbht!!