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b) -3x+2=0⇒-3x=-2⇒x=-2/-3⇒x=2/3
c) -9x+18=0⇒-9x=-18⇒x=-18/-9⇒x=18/9⇒x=2
d) 5x-20=0⇒5x=20⇒x=20/5⇒x=4
e) √5+√20≠0
f) 3x-√2=0⇒3x=√2⇒x=√2/3
g) √2x-√18+2√2=0⇒√2x-3√2+2√2=0⇒√2x-√2=0⇒√2x=√2⇒x=1
h) (5-√7)x-5-√7=0⇒(5-√7)x=5+√7⇒x=(5+√7)/(5-√7)