$$\left. \begin{array} { l } { 4 x + 3 = 10 + 1 - x + 1 = 10 } \\ { 4 x + 3 = 13 x + 10 + 2 = 15 x + 10 = 12 } \\ { \{ x + 1 - 13 x + 10 x + 10 = 124 , 15 x + 1 } \\ { x + 1 - 1 \right.$$
$x = \frac{9}{5} = 1\frac{4}{5} = 1.8$
$$4x+3=11-x+1$$
$$4x+3=12-x$$
$$4x+3+x=12$$
$$5x+3=12$$
$$5x=12-3$$
$$5x=9$$
$$x=\frac{9}{5}$$
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