$解:\ \frac {4}{3}x-16+16=-1+16$ $\ \ \ \ \ \frac {4}{3}x×\frac {3}{4}=15×\frac {3}{4}$ $\ \ \ \ \ \ \ \ \ x=\frac {45}{4}$
$解:\ \ 3x+\frac {1}{3}-\frac {1}{3}-5x=5x+\frac {1}{5}-\frac {1}{3}-5x$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -2x÷(-2)=-\frac {2}{15}÷(-2)$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x=\frac {1}{15}$
$解: 3x-7+7+x=-x-1+7+x$ $\ \ \ \ \ 4x÷4=6÷4$ $\ \ \ \ \ x=\frac {3}{2}$
$ 解:由题,把x=3代入方程2a+3x=12,解得a=\frac {3}{2}$ $把a=\frac {3}{2}代入原方程得3-3x=12,解得x=-3$ 解:化原方程为(3-b)x=6-a (1)由题,3-b≠0,b≠3 (2)由题,3-b=6-a=0,a=6,b=3 (3)由题,3-b=0,6-a≠0 a≠6,b=3
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