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(-1/3)*x+42 = 7-2*x // - 7-2*x
(-1/3)*x-(-2*x)-7+42 = 0
(-1/3)*x+2*x-7+42 = 0
5/3*x+35 = 0 // - 35
5/3*x = -35 // : 5/3
x = -35/5/3
x = -21
x = -21
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