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7*(4*x+2) = 350 // - 350
7*(4*x+2)-350 = 0
7*(4*x+2)-350 = 0
28*x-336 = 0
28*x-336 = 0
28*x-336 = 0 // + 336
28*x = 336 // : 28
x = 336/28
x = 12
x = 12
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