-5x-15+2x=-3x
-5x+2x+3x=15
-5x+5x- протилежні .
0x=15
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-5х-15+2х+3-х=0
-4х-12=0
-4х=12
х=-3
-5x-15+2x=-3x
-5x+2x+3x=15
-5x+5x- протилежні .
0x=15