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(5/5)*x-((1/5)*x)+4 = (7/10)*x // - (7/10)*x
(5/5)*x-((1/5)*x)-((7/10)*x)+4 = 0
(5/5)*x+(-1/5)*x+(-7/10)*x+4 = 0
1/10*x+4 = 0 // - 4
1/10*x = -4 // : 1/10
x = -4/1/10
x = -40
x = -40
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