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x in (-oo:+oo)
(-4/5)*x+7 = -(7*x)-151/5 // + -(7*x)-151/5
(-4/5)*x+7*x-(-151/5)+7 = 0
(-4/5)*x+7*x+151/5+7 = 0
31/5*x+186/5 = 0 // - 186/5
31/5*x = -186/5 // : 31/5
x = -186/5/31/5
x = -6
x = -6
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