1
{3x-x<5+1⇒2x<6⇒x<3<br>{7x-3x>-4⇒4x>-4⇒x>-1
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________(-1)________(3)_____
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x∈(-1;3)
2
{2≤4y-4⇒-4y≤-4-2⇒-4y≤-6⇒y≥1,5
{-5y-y≤-5-1⇒-6y≤-6⇒y≥1
//////////////////////////
_____[1]________[1,5]_________
\\\\\\\\\
y∈[1,5;∞)
3
{3x²-12≤3x²-x⇒x≤12
{5x+5x>4+6⇒10x>10⇒x>1
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____(1)________[12]______
\\\\\\\ \\\\\\\\\\\\\\\\
x∈(1;12]
4
{x²+3x-4x-12≤x²⇒-x≤0⇒x≥0
{4(x+1)-3*x>0⇒4x+4-3x>0⇒x>-4
/////////////////
________(-4)_________[0]___________
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
x∈[0;∞)