3x+(100-x)/3=100

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3x+(100-x)/3=100
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3x+(100-x)/3=100
3x+(100-x)/3=100

3x+(100-x)/3=100
3x + (100 - x)/ 3 = 100
9x + 100 - x = 300
9x - x = 300 - 100
8x = 200
x = 200÷8
x = 25

等式两边同时乘以3得:
9x+100-x=300;
8x=200;
x=25;