\(x\cdot15+x+15=463\)
\(x\cdot15+x=463-15\)
\(x\cdot15+x=448\)
\(x\cdot\left(15+1\right)=448\)
\(x\cdot16=448\)
\(x=448:16\)
\(x=28\)
x . 15 + x + 15 = 463
x . 15 + x = 463 - 15
x . 15 + x = 448
x . ( 15 + 1 ) = 448
x . 16 = 448
x = 448 : 16
x = 28
x . 15 + x + 15 = 463
x . 15 + x = 463 - 15
x . 15 + x = 448
x . ( 15 + 1 ) = 448
x . 16 = 448
x = 28
x.15+x+15==463
x:15+x=448
x.(15+1)=448
x=448:16
x=28
x : 15 + x + 15 = 463
x : 15 + x = 463 - 15
x : 15 + x = 448
x : (15 + 1) = 448
x : 16 = 448
x = 448 : 16
x = 28