The lines and their solutions are as follows:
Line 1: x + 2x + 1 = 17
Simplify: 3x + 1 = 17
Line 2: 3x + 1 = 17
Solve for x: 3x = 16
Line 3: 3x = 16
Solve for x: x = 16/3
Therefore, the solution for x in the given system of equations is x = 16/3.
Line 1: x+2x+1=17
Line 2: 3x+1=17
Line 3: 3x=16
Line 4: x=16/3
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