(2000-x)*5-40x=9190怎么解啊?

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(2000-x)*5-40x=9190怎么解啊?
(2000-x)*5-40x=9190怎么解啊?

(2000-x)*5-40x=9190怎么解啊?
(2000-x)*5-40x=9190
10000-5x-40x=9190
10000-9190=5x+40x
45x=810
x=18