5/8X+3/4*(84-X)＝58

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5/8X+3/4*(84-X)＝58
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5/8X+3/4*(84-X)＝58
5/8X+3/4*(84-X)＝58

5/8X+3/4*(84-X)＝58
5/8X+3/4*(84-X)＝58
5/8X+63-3/4X＝58
-1/8X=-5
X=40

5/8X+3/4*(84-X)＝58
5/8X+3/4*84-3/4X＝58
3/4X-5/8X=3/4*84-58
1/8X=5
X=5÷1/8
X=40

解: 5/8X+3/4*(84-X)＝58
方程两边同时乘以8得
5x+6(84-x)=58*8
5x+504-6x=464
5x-6x=464-504
-x=-40
x=(-40)÷(-1)
...

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解: 5/8X+3/4*(84-X)＝58
方程两边同时乘以8得
5x+6(84-x)=58*8
5x+504-6x=464
5x-6x=464-504
-x=-40
x=(-40)÷(-1)
x=40
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