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x√5+x=5-4
x(√5-1)=1 |:(√5-1)
x=1/(√5-1)
x=(√5+1)/(√5-1)(√5+1)
x=(√5+1)/5-1
x=(√5-1)/4
b) 1-2√3 = x√3 |:√3
x=(1-2√3)/√3
x=(√3-2*3)/3
x=(√3-6)/3
c) x - √2 = √2 x
x-√2x=√2
x(1-√2)=√2 |:(1-√2)
x=√2/(1-√2)
x=(√2)(1+√2)/(1-√2)(1+√2)
x=√2+2/1-2
x=√2+2/-1
x=-√2-2