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(6*x)/10-((3*x)/10) = 6 // - 6
(6*x)/10-((3*x)/10)-6 = 0
(6*x)/10+(-3/10)*x-6 = 0
3/10*x-6 = 0 // + 6
3/10*x = 6 // : 3/10
x = 6/3/10
x = 20
x = 20
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