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x in (-oo:+oo)
(-5/4)*(x+16)+(1/4)*x = -7 // + 7
(-5/4)*(x+16)+(1/4)*x+7 = 0
x/4-5/4*(x+16)+7 = 0
(-5/4*4*(x+16))/4+x/4+(4*7)/4 = 0
x-5/4*4*(x+16)+4*7 = 0
28-4*x-80 = 0
-4*x-52 = 0
(-4*x-52)/4 = 0
(-4*x-52)/4 = 0 // * 4
-4*x-52 = 0
-4*x-52 = 0 // + 52
-4*x = 52 // : -4
x = 52/(-4)
x = -13
x = -13
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