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4*x+1 = 133-7*x // - 133-7*x
4*x-(-7*x)-133+1 = 0
4*x+7*x-133+1 = 0
11*x-132 = 0 // + 132
11*x = 132 // : 11
x = 132/11
x = 12
x = 12
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