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(1/3)*x+(1/5)*x-4 = -52/5 // + -52/5
(1/3)*x+(1/5)*x-(-52/5)-4 = 0
(1/3)*x+(1/5)*x+52/5-4 = 0
8/15*x+32/5 = 0 // - 32/5
8/15*x = -32/5 // : 8/15
x = -32/5/8/15
x = -12
x = -12
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