Given the inequality:
$$4 x + 7 < 11$$
To solve this inequality, we must first solve the corresponding equation:
$$4 x + 7 = 11$$
Solve:
Given the linear equation:
4*x+7 = 11
Move free summands (without x)
from left part to right part, we given:
$$4 x = 4$$
Divide both parts of the equation by 4
x = 4 / (4)
$$x_{1} = 1$$
$$x_{1} = 1$$
This roots
$$x_{1} = 1$$
is the points with change the sign of the inequality expression.
First define with the sign to the leftmost point:
$$x_{0} < x_{1}$$
For example, let's take the point
$$x_{0} = x_{1} - \frac{1}{10}$$
=
$$- \frac{1}{10} + 1$$
=
$$\frac{9}{10}$$
substitute to the expression
$$4 x + 7 < 11$$
$$\frac{4 \cdot 9}{10} + 7 < 11$$
53/5 < 11
the solution of our inequality is:
$$x < 1$$
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