Add: 45x+35x\frac{4}{5x} + \frac{3}{5x}5x4+5x3 for x≠0x \neq 0x=0.
75x\frac{7}{5x}5x7
710x\frac{7}{10x}10x7
1225x\frac{12}{25x}25x12
1x\frac{1}{x}x1