Trouble With system of Equations Logic.

NB. Solve The System of Equations by the substation method
NB. {x+2y+5 = _5+5y-x, 2x+3x=y+6}
x+2y+5=_3+5y-x NB. _ means Negative Number
x+2y+5+x=_3+5y-x+x
2x+2y+5=_3+5y
2x+5=_3+3y
2x=_8+3y
2x=3y-8