(7x - 15) = 27+21
(7x - 15)= 48
7x= 48+15
7x= 63
x= 63:7
x= 9
56x -120 -21 =27
56x = 27+210 +21
56x = 168
x = 3
\(\left(7x-15\right).8-21=27.\Leftrightarrow\left(7x-15\right).8=48.\Leftrightarrow7x-15=6.\Leftrightarrow x=3.\)
\(\left(7x-15\right).8-21=27\\ \left(7x-15\right).8=27+21\\ \left(7x-15\right).8=48\\ \left(7x-15\right)=48:8\\ \left(7x-15\right)=6\\ 7x=6+15\\ 7x=21\\ x=21:7\\x=3 \)
(7x - 15) = 27+21
(7x - 15)= 48
7x= 48+15
7x= 63
x= 63:7
x= 9
(7x-15).8-21=27
(7x-15).8=27+21
(7x-15).8=48
7x-15=48:8
7x-15=6
7x=6+15
7x=21
x=21:7
x=3
