X=6 because 27+3=30 and 30 divides by 5 is 6.
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The generalisation is that multiplication is Abelian (or commutative) for numbers.
If you're asking what x equals, it equals 5 because 5x3=15, and 15-2=13.
3x+5=20 x=5 since 5x3+5=20
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.
3x4 plus 5x3 plus x2 - 5 divided by x 2 =[(3x4) + (5x3) + (x2 - 5)]/x2 =(12 + 15 + x2 -5)/x2 =(27 - 5 + x2)/x2 =(22 + x2)/x2