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4\left(1+2\right)=3\left(3+4\right)
Multiply both sides of the equation by 12, the least common multiple of 3,4.
4\times 3=3\left(3+4\right)
Add 1 and 2 to get 3.
12=3\left(3+4\right)
Multiply 4 and 3 to get 12.
12=3\times 7
Add 3 and 4 to get 7.
12=21
Multiply 3 and 7 to get 21.
\text{false}
Compare 12 and 21.
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