\(5x\left(4+2\right)+3x=240\) \(\left(8x+x+63\right):11=9\)
\(20x+10x+3x=240\) \(8x+x+63=99\)
\(33x=240\) \(9x=36\)
\(x=\frac{240}{33}\) \(x=4\)
5.(4x + 2) + 3x = 240
20x + 10 + 3x = 240
23x + 10 = 240
23x = 240 - 10
23x = 230
x = 230 : 23 = 10
31.57.x - 57.14.x = 85.57
(1767 - 798 ).x = 4845
969 . x = 4845
x = 4845 : 969
x = 5
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\Rightarrow100x+\left(1+2+3+...+100\right)=5750\)
\(\Rightarrow100x+\left(1+100\right).50=5750\)
\(\Rightarrow100x+5050=5750\)
\(\Rightarrow100x=700\)
\(\Rightarrow x=7\)
\(9x+63=9.11=99\)
\(9x=99-63=36\)
\(x=36:9=4\)
