Hey!
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Steps To Solve:
3х - 15 = 36
~Add 15 to both sides
3x - 15 + 15 = 36 + 15
~Simplify
3x = 51
~Divide 3 to both sides
3x/3 = 51/3
~Simplify
x = 17
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Hence, x equals 17!
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Hope This Helped! Good Luck!