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3*(x-10)+9*((7*x)/8) = 0
3*(x-10)+(63*x)/8 = 0
(3*8*(x-10))/8+(63*x)/8 = 0
3*8*(x-10)+63*x = 0
87*x-240 = 0
(87*x-240)/8 = 0
(87*x-240)/8 = 0 // * 8
87*x-240 = 0
87*x-240 = 0 // + 240
87*x = 240 // : 87
x = 240/87
x = 80/29
x = 80/29
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