5x - 3 = 22
add three to both sides
5x = 25
divide both sides by 5
x = 5
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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.
No. x=3. (5x3 is 15 or 5x =15-3=12)