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2x - x√2 = 4
x(2 - √2) = 4 / : (2 - √2)
x = 4 / (2 - √2) = [ 4(2 + √2) ] / (4 - 2) = [4(2 + √2)] / 2 = 2(2 + √2) = 4 + 2√2
4 + 2√2 = a + b√2
a = 4
b = 2
a = b = 4 + 2 = 6
2x-x√2=-1+5
x(2-√2)=4 /:(2-√2)