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13 - 3X = 4X + 1

add 3X to each side

13 - 3X + 3X = 4X + 3X + 1

13 = 7X + 1

subtract 1 from each side

13 - 1 = 7X + 1 - 1

12 = 7X

divide both sides integers by 7

12/7 = (7/7)X

12/7 = X

=========check in original equation

13 - 3(12/7) = 4(12/7) + 1

13 - 36/7 = 48/7 + 1

13 and 1 need to be converted to fractions ( 13 * 7 = 91, so/ 91/7 = 13 ; 1 = 7/7 )

91/7 - 36/7 = 48/7 + 7/7

55/7 = 55/7

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Q: What is x for 13 - 3x equals 4x plus 1?
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