a: =>5(x-3)=25
=>x-3=5
hay x=8
b: =>5(x+7)=20+40=60
=>x+7=12
hay x=5
c: =>x-36=216
hay x=252
`[45]`
`a, 5xx(x-3) = 25`
`(x-3) = 5`
`x = 8`
`b, 5 xx (x+7) = 60`
`x+7=12`
`x=5`
`c, x-36 = 12 xx 18`
`x - 36 = 216`
`x = 252`.
`d, 119 - (x-6) = 102`
`x - 6 = 17`
`x = 23`
\(80-5\left(x-3\right)=55\)
\(5\left(x-3\right)=80-55\)
\(5\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
_____________________________
\(5\left(x+7\right)-40=2^2.5\)
\(5\left(x+7\right)-40=20\)
\(5\left(x+7\right)=20+40\)
\(5\left(x+7\right)=60\)
\(x+7=60:5\)
\(x+7=12\)
\(x=12-7\)
\(x=5\)
___________________________
\(\left(x-36\right):18=12\)
\(x-36=12.18\)
\(x-36=216\)
\(x=216+36\)
\(x=252\)
_________________________
\(2448:\left[119-\left(x-6\right)\right]=24\)
\(119-\left(x-6\right)=2448:24\)
\(118-\left(x-6\right)=102\)
\(x-6=118-102\)
\(x-6=16\)
\(x=16+6\)
\(x=22\)
