x(x+4)=144-4. Find x
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x(x+4)=144-4
==> x²+4x = 140
==> x²+4x -140 = 0
==> x²+14x-10x-140 = 0
==> x(x+14) -10(x+14)
==> (x+14) (x-10)
==> x = -14 ; 10
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