(5x-30):3x=2:
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(5x-30):3x=2:(5x-30):3x=2:(5x-30):3x=2:15x-90=6x3（5x-30）=6x15x-6x=909x=90x=10解方程两边同乘3x得：5x-30=2x3x=3
(5x-30):3x=2:
(5x-30):3x=2:
(5x-30):3x=2:
15x-90=6x
3（5x-30）=6x
15x-6x=90
9x=90
x=10
解 方程两边同乘3x
得：5x-30=2x
3x=30
x=10
当x=10时 3x≠0
∴x=10是方程的解
3x分之5x—30=3分之2
化为分数后去分母就好做了，不能讲答案哦
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