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(1/3)*(3*x-15) = -7 // + 7
(1/3)*(3*x-15)+7 = 0
1/3*(3*x-15)+7 = 0
1/3*(3*x-15)+7 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x = -2
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