12х-13(х-5)=12+12(х+1)
12х - 13(х - 5) = 12 + 12(х + 1) 12х - 13х + 65 = 12 + 12х + 12 12х - 13х - 12х = 12 + 12 - 65 -13х = -41 х = -41 : (-13) х =