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(4/5)*x-30 = (3/10)*x-4 // - (3/10)*x-4
(4/5)*x-((3/10)*x)-30+4 = 0
(4/5)*x+(-3/10)*x-30+4 = 0
1/2*x-26 = 0 // + 26
1/2*x = 26 // : 1/2
x = 26/1/2
x = 52
x = 52
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