Therefore 5x=35, x=35/5, hence x=7
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4 x 8 =32
The generalisation is that multiplication is Abelian (or commutative) for numbers.
If you're asking what x equals, it equals 5 because 5x3=15, and 15-2=13.
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3x+5=20 x=5 since 5x3+5=20