Solution:

x÷7=0.3

x=0.3x7

x=2. 1

Test: 2. 1÷7=0.3.

Extended data:

Solving equation X is not necessarily placed on the left side of the equation, or there are two X's in an equation, which needs to be solved by simple calculation methods in mathematics. Some formulas have an X on the right, which can be simply calculated in a different position.

For some equations, the general form of the solution has been studied and become a fixed formula, which can be used directly. Generally solvable multivariate higher-order equations have formulas to follow.