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It gives you the answer
get y by itself by -3y from both sides. Then subtract 17 from both sides, that gives you 7y=28 then divide both sides by 7 and you get 4.
28 = 7y
y = 28/7
therefore y = 4
well you just go through the numbers for y
such as y=1, y=2, y=3 and work out the probem
untill you get your answer
FULL EXPLANATION AND ANSWER
Since 10y contains the variable to solve for, move it to the left-hand side of the equation by subtracting 10y from both sides.
Since 3y and -10y are like terms, add -10y to 3y to get -7y.
Since 45 does not contain the variable to solve for, move it to the right-hand side of the equation by subtracting 45 from both sides.
Add 17 to -45 to get -28.
Divide each term in the equation by -7.
Simplify the left-hand side of the equation by canceling the common factors.
Simplify the right-hand side of the equation by simplifying each term.