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(1,5-6x)=-3(2+x)
opuszczamy spokojnie nawiasy
1,5-6x=-3*2-3*x
1,5-6x=-6-3x
"x" na lewo, reszta na prawo:
-3x=-6-1,5
-3x=-7,5 |:(-3)
x=2,5
1,5-6x=-6-3x
-6x+3x=-6-1,5
-3x=-7,5 /:(-3)
x=2,5