7x-13.21=5x+16.
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7x-13.21=5x+16.7x-13.21=5x+16.7x-13.21=5x+16.7x-13.21=5x+16.39（注意移项要变号）7x-5x=16.39+13.212x=29.6x=29.
7x-13.21=5x+16.
7x-13.21=5x+16.
7x-13.21=5x+16.
7x-13.21=5x+16.39
（注意移项要变号）7x-5x=16.39+13.21
2x=29.6
x=29.6∕2=14.8
7x-13.21=5x+16.39
7x-5x=16.39-13.21
2x=3.18
x=1.59
7x-5x=16.39+13.21
2x=29.60
x=14.80
7x-5x=16.39+13.21 2x=29.60 x=14.80
移项2x=29.6 x=14.8
7x-29.6=5x
x=14.8
7x-13.21=5x+16.
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