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4-3x-15+1=2x+10;
4-15+1-10=2x+3x;
-20=5x;
X=-20:5;
X=-4;
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4-3•(x+5)+1=2•(x+5);
4-3•(-4+5)+1=2•(-4+5);
4-3•1+1=2•1;
1+1=2;
2=2;