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(4/5)*x-((3/10)*x) = -3 // + 3
(4/5)*x-((3/10)*x)+3 = 0
(4/5)*x+(-3/10)*x+3 = 0
1/2*x+3 = 0 // - 3
1/2*x = -3 // : 1/2
x = -3/1/2
x = -6
x = -6
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