2x-3x+1 can be simplified (by combining like terms, or terms with the same number/type of variables) to -x+1. This is not an equation, but an "expression," meaning that there is no equals sign, and you cannot solve for x without an equals sign. If, for instance, that entire expression was equal to 7,
-x+1=7
-x = 6
x = -6
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sixteen m squared plus eight m plus 1
When simplified it is: 1-8x
2y + 7x + y-1?
That factors to (a + 1)(a + b) a = -1, -b b = -a