7x+10=31x
so 10=31x-7x
or 10 =24x
in which case x=10/24 or 5/12
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3+3x+7x=13 3x+7x=10 10x=10 x=1
combine like terms. 3x+1+4x-5=31 3x+4x=7x 7x+1-5=31 1-5=-4 7x-4=31 then solve it 7x=35 x=5
This is only true if x = -31.
134
7*7+11*10=159