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x+10.2−x+30.01＝50．
The deformation of the equation is: 10x + 102-100x + 3001 = 50, the denominator is removed to get: 10x + 10-200x-600 = 100, the combination of terms is - 190x = 690, and the solution is: x = - 6919
5 (x + 2) - 3 (1-x) = 23,
5(x+2)-3(1-x)=23
5x+10-3+3x=23
8x+7=23
8x=16
x=2
3 (15 + x) = 60
3(15+x)=60
45+3x=60
3x=60-45
3x=15
x=15/3
x=5
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