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(2/3)*x-((3/5)*x) = -7 // + 7
(2/3)*x-((3/5)*x)+7 = 0
(2/3)*x+(-3/5)*x+7 = 0
1/15*x+7 = 0 // - 7
1/15*x = -7 // : 1/15
x = -7/1/15
x = -105
x = -105
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