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4*(7*x+3) = -240 // + 240
4*(7*x+3)+240 = 0
4*(7*x+3)+240 = 0
28*x+252 = 0
28*x+252 = 0
28*x+252 = 0 // - 252
28*x = -252 // : 28
x = -252/28
x = -9
x = -9
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