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1/1,4 = 5/x | *x
1x/1,4 = 5x/x
1x/1,4 = 5 | *1,4
1x = 5*1,4
x = 7
b)
4/3 = (6x+4)/(4x-4) |*(4x-4)
4*(4x-4) / 3 = (6x+4) |*3
4*(4x-4) = 3*(6x+4)
16x - 16 = 18x + 12
-16 - 12 = 18x - 16x
- 28 = 2x
x = -14