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(-5/7)*(5*x+5)-((1/7)*(6*x+9)) = 0
(-5/7)*(5*x+5)+(-1/7)*(6*x+9) = 0
-5/7*(5*x+5)-1/7*(6*x+9) = 0
-5/7*(5*x+5)-1/7*(6*x+9) = 0
-31/7*x-34/7 = 0
-31/7*x-34/7 = 0
-31/7*x-34/7 = 0 // + 34/7
-31/7*x = 34/7 // : -31/7
x = 34/7/(-31/7)
x = -34/31
x = -34/31
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