These are two expressions, not equations. Expressions do not have solutions, only equations do.
NB equations include the equals sign.
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2x2 + x2 = 3x2
x2 + x2 = 2x2 2x^2
2x2 + (5x-4x)2 + (x-x)2 = 2x2 + x2 + 02 = 2x2 + x2 = 3x2
x2 - (2x)2 = x2 - 4x2 = -3x2 x2 - 2x2 = -x2
x2+2x-120 = (x+12)(x-10) when factored