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5x-3(20-x)=3x-7(9-x)
人气:127 ℃ 时间:2020-02-04 08:04:19
解答
5x - 3(20 - x) = 3x - 7(9 - x)
5x - 60 + 3x = 3x - 63 + 7x
8x - 60 = 10x - 63
10x - 8x = 63 - 60
2x = 3
x = 3÷2
x = 1.5
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