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(4*x)/5-((7/10)*x) = 3 // - 3
(4*x)/5-((7/10)*x)-3 = 0
(4*x)/5+(-7/10)*x-3 = 0
1/10*x-3 = 0 // + 3
1/10*x = 3 // : 1/10
x = 3/1/10
x = 30
x = 30
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