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(3/10)*x-3 = 7-((1/5)*x) // - 7-((1/5)*x)
(3/10)*x+(1/5)*x-7-3 = 0
1/2*x-10 = 0 // + 10
1/2*x = 10 // : 1/2
x = 10/1/2
x = 20
x = 20
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