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y + 12 = 20
2x + 6, there is a word than which means that the first given(six) should change place with the second given(twice a number), more than is equivalent to addition (+)
for twice a number, twice means 2 and a number is and letter or variable, so this means that 2 is being multiblied with any letter or variable.
k - 7, the word than is present again so intherchange the given, less than is equivalent to subtraction (-)
2x + 7 = 1
x - 8 = 15, difference is equivalent to subtraction