the answer is x=1. This is how I worked it out
5x-3=2
2+3=5
5 divide 5 = 1
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If you're asking what x equals, it equals 5 because 5x3=15, and 15-2=13.
The generalisation is that multiplication is Abelian (or commutative) for numbers.
3x+5=20 x=5 since 5x3+5=20
5x3 - 3x2 + 2x = x*(5x2 - 3x + 2) The quadratic has no real factors.
y = 5x3 + 6 is a cubic equation, not a linear equation. Linear equations contain only terms of degree 0 (i.e. constants) and terms of degree 1.