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::<math>3 \times x + 4 \times x = 56\,</math>
::<math>3 \times x + 4 \times x = 56\,</math>
At this point we use the ''distributive law'', along with the principle that
At this point we use the ''distributive law'', along with the principle that
::The various laws of mathematics (commutative, associative, distributive) even when the items appearing in the expressions are unknowns.
::The various laws of mathematics (commutative, associative, distributive) work even when the items appearing in the expressions are unknowns.
The distributive law tells us that
The distributive law tells us that
::<math>3 \times x + 4 \times x = (3+4) \times x\,</math>
::<math>3 \times x + 4 \times x = (3+4) \times x\,</math>